Detective Sergeant Daniel D. "Danny" Williams is a police Detective who originally worked in New Jersey but moved to Hawaii to remain close to his daughter, Grace Williams. He later became a member of the Hawaii Five-0 Task Force and the partner of Lieutenant Commander Steve McGarrett.
In the rare event that Steve is absent or even away on duties for the Navy, Danny will become the acting leader of the team which is notably seen in the Season 2 episode, "Ha'alele" and also the two crossover episodes with NCIS: Los Angeles, "Pa Make Loa" and "Touch of Death".
After highschool Danny went to college and minored in business.
Danny later presumably joined the Newark Police Department and as a beat cop, met his future wife, Rachel Edwards who rear-ended his car to get his attention.
The two got married and had a daughter, Grace Williams.
Unfortunately, for unknown reasons, the marriage failed with the two later divorcing. It is hinted that Rachel couldn't handle the life of being a cop's wife.
When Rachel remarried businessman Stan Edwards and moved to Hawaii with Grace, Danny was left with no choice but to follow them to Hawaii for fear of losing visitation rights to Grace and upon arriving on Hawaii, Danny subsequently joined the Honolulu Police Department, partnering with Detective Meka Hanamoa.
This brought him into contact and conflict with John's son, Lieutenant Commander Steve McGarrett who sought to personally investigate the crime himself and as such, this led to bad blood between the two and Steve used his influence to become the leader of the unnamed Task Force.
Despite Danny's misgivings, Steve appointed Danny as the second-in-command of the team and also made Danny his partner in the field.
Unfortunately, things eventually came to a head in the aftermath of a shooting where Danny threatened Steve, Steve responded by placing Danny in an armlock before forcing Danny to apologize.
Danny, on the other hand upon being let go punched Steve and remarked, "You're right. I don't like you" before leaving while Steve was left reeling and obviously stunned that he had underestimated Danny.
However, the team later grew to accept and value Danny's skills as seen during Malama Ka Aina (episode) where Danny gave them information about a crime boss he had presumably encountered or heard of during his days as a cop in New Jersey.
In Ua Hiki Mai Kapalena Pau (episode), Danny fell ill after touching the body of a man to check for a pulse.
This incapacitated him for a time and he suffered convulsions, forcing him to be taken to hospital for treatment. Agent Jenna Kaye later realized that Danny had been infected with sarin. As such, with Danny in hospital, the team turned their attention to finding out who had poisoned the victim and Danny.
Danny eventually made a full recovery and it was later revealed that he was having an affair with Rachel, his ex although they later broke it off for good with Rachel returning to her husband, Stan Edwards.
When Steve headed to Japan to find Joe White and seek answers in regards to "Shelburne", Danny took temporary control of the team as they investigated a serial killing case and later a possible smallpox outbreak which despite the two team's best efforts ended with the group realizing that a suspect has fled to the mainland.
This had Danny and Lieutenant Chin Ho Kelly traveling to Los Angeles, California along with Special Agent G. Callen and Special Agent Sam Hanna to help stop the spread of smallpox which occurred in the last few seconds of the Hawaii Five-0 Season 2 /NCIS: Los Angeles Season 3 crossover episode, Pa Make Loa and concluded in the second and final part of the Hawaii Five-0/NCIS: Los Angeles episode, "Touch of Death".
In the NCIS: Los Angeles episode, Touch of Death (episode), Danny and Chin arrived in Los Angeles and headed to the NCIS: Office of Special Projects to assist Callen, Sam and the OSP team on stopping a smallpox outbreak from happening.
While there, Danny butted heads with NCIS/LAPD Liaison Officer Detective Marty Deeks who jokingly regarded as Danny's hair as being "bulletproof" while the two exchanged constant insults about one another.
Danny also developed a fear towards towards the NCIS: Office of Special Projects Manager Henrietta Lange but he ultimately formed friendships with the whole OSP team and once the smallpox case was solved, he and Chin returned to Hawaii.
In the finale, Danny began fighting Rachel for custody of Grace when it was revealed that she and Stan were planning to move to Las Vegas.
Danny meets Steve's mother in the first episode and even informs Steve of Wo Fat breaking out of prison as well as the fact that Dr. Malia Waincroft, Chin's wife has died.
Following an appearance in family court, Danny gains custody of Grace.
In the Season 3 finale episode, Aloha, Malama Pono (episode), Danny reignited his relationship with Gabby.
In Ina Paha (episode), in an alternate reality that Steve hallucinates, the Danny Williams of that reality who saved the alternate John McGarrett from being killed by that reality's Victor Hesse is more laid-back and carefree, compared to the normal Danny.
He has also adjusted to living in Hawaii and even speaks the Hawaiian language.
In addition, he is still married to Rachel Edwards and is even seen wearing a wedding ring with the two's relationship being as strong as ever.
Despite that, Danny in the alternate reality is much more aggressive, almost ruthless when it comes to interrogating suspects, similar to Steve in the main timeline. This is shown when Danny interrogates the AU Victor Hesse by shooting him in the kneecap while using a pillow to muffle the gunshot.
In O ka Pili'Ohana ka 'Oi (episode), Danny helped Grover.
In the Season 5 premiere episode, A'ohe kahi e pe'e ai (episode), Danny met Marco Reyes who informed Danny that Matt Williams, Danny's brother had been captured. In Ka No'eau (episode), Danny confronts Marco Reyes he pays him for his brother to be released. After he gives Marco Reyes the money he finds out his brother is already dead. When Reyes' men kick Steve and Danny out, Danny and Steve shoot them and kill Marco Reyes and his guys. In Nanahu (episode), Danny goes on a weekend stay with Melissa Armstrong (Amber) he gets attacked by her abusive ex when he shows up and stabs Danny. Danny fights him off and Melissa runs her ex over with Danny's car on the way to take Danny to the hospital.
At the end of The 5th season, it was revealed that Charlie is actually Danny's son, and that he's sick.
In Kanaka Hahai, Danny's car is stolen while he is hanging out with Charlie and Grace. In the Season finale O Ke Ali'I Wale No Ka'u Makemake, Steve and Danny are working undercover on a plane full of drugs when their plane comes under attack and Steve almost dies after being shot. Danny is forced to land the plane on the beach so that Steve does not die. When they land the plane and Steve goes to the hospital, it is discovered that he needs a liver transplant. Danny is a match for Steve so he undergoes surgery to give Steve part of his liver.
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In "Aloha Goodbye" Danny gets kidnapped led by Daiyu Mei. Steve McGarrett later traces the location of Danny after Daiyu Mei contacts Steve saying she will trade the cipher in exchange for the location of Danny's life. Danny manages to break free but gets shot after an unsuccessful escape. Steve McGarrett saves Danny's life by taking him to the hospital.
Unlike Steve, who is typically calm and in control, Danny is nearly always displaying one emotion or another. The most obvious is anger, as he possesses a very hot-headed nature with a vicious temper to match. He's also the most outspoken of the team and quite possibly the whole H50 Force and HPD, regardless of where he is and who's around to hear him.
Despite his often off-putting, and at times offensive, attitude, Danny is also one of the most openly affectionate characters and fiercely loyal to his friends and family.
Of the four main members of the task force, Danny is the most vocal. As his partner and, as Danny calls him, an animal and Neanderthal, Steve is the person most often on the receiving end of one of Danny's long-winded explanations of what is wrong with the current situation, as Danny expresses a deep dislike for Steve's methods, such as going into a house without back-up, and isn't afraid to tell him so as loudly as he pleases.
Despite his abrasive personality, both Steve and Meka cite Danny as a great cop with good instincts. He is also shown to comfort the victim/victim's family when they are in distress, presumably because Danny is a father.
Although Danny moved to Hawaii, he only did so to stay close to his daughter, Grace, whom he loves dearly. He also spends most of the time trying to impress her or worrying about her safety.
In the episode, E Malama (episode), Danny threatened to kill a business man if he ever endangered Grace again after she and Rachel were victims of a carjacking.
At the end of Loa Aloha (episode) when he confronts his brother about his crimes, Danny chose to say goodbye rather than shoot him.
Danny was shown to be fiercely protective of his family as seen in the episode, E Malama (episode) where he threatened to kill a businessman who had unknowingly endangered the lives of Danny's ex-wife, Rachel and daughter, Grace and in a deleted scene from that same episode, Danny was seen telling Stan that if he ever put her (Grace) in danger again, then Stan would find that the scariest criminal in the world is a cop who didn't care anymore, hinting that if Grace was ever hurt again or presumably even killed, then Danny would go off the rails altogether.
In the Season 2 episode, Mai Ka Wa Kahiko (episode), Danny's dark side emerged with a vengeance where after shooting his ex-wife's husband in the shoulder, Danny shot his ex-partner in the right kneecap, much to the horror of Steve, Kono and Chin and very calmly yet coldly threatened to kill Peterson by shooting him in the head if he did not tell Danny where Grace was. This suggests that Danny is willing to do anything to guard Grace, maybe even resort to killing or threatening someone to ensure her safety.
Danny's darker side again emerged in the Season 3 episode, Ho'opio (episode) where he beat up two suspects during the investigation concerning the murder of a young girl and the subsequent disappearance of another, presumably due to the fact that the girls bore a striking resemblance to Grace.
During the interrogation of one suspect, Danny knocked the suspect off his chair, forcing Steve to physically restrain him while during the interrogating of a man and his wife who the team believed were the kidnappers responsible, Danny later hit the man once, prompting Steve to ask for Danny's two badges albeit temporarily. Danny later gave them to Steve and proceeded to beat the man while Steve calmly walked out of the house as the punching was heard.
Much to Steve's confusion, Danny despises Hawaii, calling it a "pineapple-infested hell hole." This point is further proven by the way that he does not care at all what the locals think about him wearing a tie. Danny does not like the water either; it is hinted that Danny does not like the water because he cannot swim.
However, halfway through Season One, Danny is seen trying to surf. In Lana I Ka Moana (episode), Danny tells Steve that he actually used to love the ocean, but started hating it when his best friend Billy died on the ocean while swimming towards Danny to help him.
Danny actually did dive into the ocean once during a case which left Steve greatly impressed and when Steve remarked "Book 'em, Danno", Danny replied, "Book me a towel".
Although Danny denies it, Steve observes that Danny likes Hawaii. When Danny first met Steve, it seemed that Danny hated Steve more than Hawaii itself. Danny also didn't like it when Steve kept calling him "Danno." Likewise, Danny mockingly calls Steve "Steven." Even though Danny tries to hide it, they have become friends, and deeply care about one another, and completely trust each other. Danny also expresses concern about Steve's behavior, as he believes that Steve needs professional help for his inhumane behavior and attitude.
Like the rest of Five-0, Danny is shown to have complete loyalty to Steve.
Since Heihei (episode), Danny's relationship with Rachel is less strained than it was in the beginning of the series, especially in Loa Aloha (episode). Danny is shown to dislike Stan Edwards, Rachel's husband.
Danny appears to have claustrophobia. He has panic attacks when confined to a small space.
Danny is a man in his early or mid-thirties with short blonde hair with brown highlights and blue eyes.
As the second-in-command of the Hawaii Five-0 Police Force and also the longest-serving Detective, Danny is exceptionally skilled.
Despite not harboring the same training or ability for sharpshooting that Steve and Kono possess, Danny is well-trained in firearms and capable of either shooting to kill or shooting to incapacitate.
- Hand to Hand Combat
Although he tries to avoid it, Danny has shown that he is capable of defending himself if he gets into trouble whenever he's out in the field.
- Interacting/Connecting with Children
As he is the father of a teenage girl, Danny is usually sympathetic towards other children and is skilled when it comes to dealing with kids in general.
Danny is fluent in Spanish and knows some Russian phrases.
Steve is Danny's partner in the field and also the one who is more than likely to give a headache given Steve's preferred method of doing things by himself. Their partnership began on rough grounds as Danny was the Detective assigned to investigate the death of Steve's father, John.
After some rough beginnings which ended with Danny punching Steve and telling Steve that he didn't like him, the two later got past their differences and began working alongside each other although Steve's actions at times such as going into the field without back-up manage to annoy Danny to no end. However, Steve does show care for Danny to the extent that Steve allows Danny to stay in his house for a while and even gave Danny a key to his house.
Fans of the show have often compared Steve and Danny's friendship as a bromance between the two with the term McDanno being coined to suggest a possible romantic relationship.
- They are each others Emergency Contacts
- Kono Kalakaua is the only original cast member not to spend time in jail. Steve McGarrett spent just over a week in Halawa Correctional Facility.  Chin Ho Kelly spent 8 hours in Halawa Correctional Facility,  and was arrested 2 years later. . Danny spent a few days in a Colombian prison. 
- Danny originally drove a 2010 Ford Mustang GT 5.0 before switching to a 2010 Chevrolet Camaro RS; since then, the latter model has become his signature vehicle.  
- Danny is shorter than his brother Matt Williams and sister Bridget Williams.
- Danny originally used a SIG Pro SP2009  before switching to a Heckler & Koch P30.  His back-up weapon is a Smith & Wesson Bodyguard 38. 
- Danny's badge number is 7576. 
- Always wore ties until "Ua Hiki Mai Kapalena Pau" and after Steve went to jail, began wearing button up shirts more often. 
- Danny and Steve are each others Emergency Contacts. 
- Danny and Steve have the same blood type, and now share a liver. 
- Steve McGarrett, Danny and Harry Langford were all given awards by Her Royal Highness, Queen Elizabeth II of England. 
- Danny and Rachel Edwards first meet, when she hits him with her car. 
- In the Original Hawaii Five-O, Melissa was Danny's highschool sweetheart named Melissa Lovejoy. 
- Danny broke his arm when he fell off a ladder.  
- Main article: Danny Williams/Appearance
|Ha'i'ole||Ua Lawe Wale||Kame'e||Mea Makamae||Ma'eme'e||Ka Hakaka Maika'i||Ka Iwi Kapu||Lapa'au||Ike Maka||Kil'ilua||Pahele||Alaheo Pau'ole|
|Ka Ho' Oponopono||Pu'olo||Mai Ka Wa Kahiko||I Helu Pu||Kupale||Lekio||Kalele||Ha'alele||Pa Make Loa||Ua Hopu||Ua Hala|
|A'ohe kahi e pe'e ai||Ka Makuakan||Kanalu Hope Loa||Ka Noe'au||Ho'oilina||Ho'oma'ike||Ina Paha||Ka Hana Malu||Ke Koho Mamao Ak||Wawahi moe'uhane||Ua'aihue||Poina 'Ole||La Po'ino|
|Powehiwehi||E 'Imi pono||Nanahu||Kuka'awale||Pono Kaulike||Kahania||Ike Hanau||Ua helele'i ka hoku||Ho'amoano||Mo'o 'olelo Pu||Luapo'i||A Make Kāua|
|Mai ho`oni i ka wai lana mâlie||Lehu a Lehu||Ua 'o'oloku ke anu i na mauna||Ka Papahana Holo Pono||Ka 'alapahi nui||Na Pilikua Nui||Na Kama Hele||Piko Pau 'iole||Hana Keaka||Ka Makau kaa kaua||Kuleana||Ua Ola Loko I Ke Aloha||Umia Ka Hanu|
|Hoa 'Inea||Ke Koa Lokomaika'i||Ka Pohaku Kihi Pa'a||Waiwai||Kanaka Hahai||Malama Ka Po'e||Ka Haunaele||Ka Pono Ku'oko'a||I'ike Ke Ao||Pilina Koko||Pa'a Ka 'Ipuka I Ka 'Upena Nananana||O Ke Ali'I Wale No Ka'u Makemake|
|Makaukau 'ce e Pa'ani||No Ke Ali'i' Wahine A Me Ka Aina||He Moho Hou||Hu a'e ke ahi lanakila a Kamaile||Ke Ku 'Ana||Ka hale ho'okauweli||Ka makuahine a me ke keikikane||Hana Komo Pae||Elua la ma Nowemapa||Ka Luhi||Ka’ili aku||Ka 'Aelike||Ua ho'i ka 'ōpua I Awalua|
|Ka laina ma ke one||Ka Pa'ani Nui||Poniu I Ke Aloha||Hahai i nā pilikua nui||E mālama pono||Puka 'ana||Huikau nā makau a nā lawai'a||Ua malo'o ka wai||Waimaka 'ele'ele||Wehe 'ana||He ke’u na ka ‘alae a Hina||Ua mau ke ea o ka 'aina i ka pono|
|Fire Will Never Say that It Has Had Enough||Dog Days||Your Knife, My Back. My Gun, Your Head||No Matter How Much One Covers a Steaming Imu, The Smoke Will Rise||At Kama'oma'o, The Land of Activities||Unfolded by the Water are the Faces of the Flowers||The Royal Eyes Rest Above||The Trail Leads To A Diving Place; Do Not Follow After||Death at Sea||The Future is in the Past||A Tall Tree Stands Above the Others||The Round Up||What is Gone is Gone|
|The Children of Kalaihaohia||A Coral Reef Strengthens Out into Land||Only the Stars of Heaven Know Where Pae Is||The Fire Blazed Up, Then Only Ashes Were Left||To Do One's Duty||No One Has Ever Died For the Mistakes He Has Made; Only Because He Didn't Repent||Kind Is the Bird of Kaiona||The Answer to the Riddle is Seen||Though the Fish is Well Salted, the Maggots Crawl||What Parents Will Do, Children Will Do||The Tough Branch That Does Not Break in the Kona Gale||Ancients Exposed|
|Cocoon||The Man Who Fell from the Sky||When the Sea Draws Out the Tidal Wave, the Rocks Where the Cowries Hide Are Exposed||On the Slope of the Cliff, Not One Jutting Rock is Hidden from Sight||Nothing More the Eyes to Search For||Is Borne on the Back; Is Borne in the Arms||The Smoke Seen in the Dream Now Rises||Birds of a Feather...||Truth Comes from the Night||When the Light Goes Out, the House Is Dark||Gone on the Road from which There Is No Returning||A Bruise Inflicted on an Innocent Person Vanishes Quickly||Those Above are Descending|
|Depressed with the Heat of Kealwalua||Made Prisoner by the Reign of the Rain||When Covetousness is Conceived, Sin is Born||Offer Young Yaro Leaves to||He Who Eats 'Ape is Bound to Have His Mouth Itch||The Octopus of the Deep Spews It's Ink||Way of the Gun||Offspring of an Owl||The Teacher, the Pupil - Let it Come Forth||A Stranger Only for a Day||The Hand is at Fault||Endlessly Pours the Rain of Waianae|
|The Skin Has Been Hurt by the Point of the Spear||Knocked Flat by the Wind; Sudden Disaster||Passing Time Obscures the Past||Tiny is the Flower, Yet it Scents the Grasses Around It||Don't Blame Ghosts and Spirits for One's Troubles; a Human is Responsible||All Knowledge is Not Learned in Just One School||DNA||That Way and This Way Shifts the Sand of Punahoa||The Trunkless Tree of Kahilikolo||You and Me, It Is Hidden||To Return Evil for Evil||Where Were You When the Rain was Pouring?||The Rat was Caught Right in the Nest|
|There Was a Lull, and then The Wind Began to Blow About||Yours is the Mouth of an Octopus||Man is a Slave of Love||Like a Whirlwind, Whirling the Dust Upward||Lost in the Sea Sprays||Home Go the Very Tough Lads of the Hills||A Gripping Cuttlefish||He Cannot be Caught for He is an Ulua Fish of the Deep Ocean||Goodbye|
- NCIS: Los Angeles- Season 3 episode, "Touch of Death"
|Hawaii Five-0 Characters|
|Final|| Steve McGarrett • Danny Williams • Adam Noshimuri • Tani Rey • Junior Reigns • Lou Grover • Kamekona Tupuola • Duke Lukela • Noelani Cunha • Quinn Liu|
|Former|| Chin Ho Kelly • Kono Kalakaua • Max Bergman • Catherine Rollins • Jerry Ortega|
|Other||Lori Weston • Mary McGarrett • Grace Williams • Charles Williams • Jenna Kaye • Dr. Malia Waincroft|