Thomas Alexander Dekker (born December 28, 1987) is an American actor, musician, singer, director and producer. He is known for his roles as John Connor in Terminator: The Sarah Connor Chronicles, Adam Conant on The Secret Circle, and Zach on Heroes.

Dekker did the voice of Littlefoot in The Land Before Time V-IX (singing voice in The Land Before Time V) and as Fievel Mousekewitz in An American Tail: The Treasure of Manhattan Island and An American Tail: The Mystery of the Night Monster. Dekker portrayed Jesse Braun in the 2010 remake of A Nightmare on Elm Street and Smith in Gregg Araki's film Kaboom. Dekker starred as Gregory Valentine in the TV show Backstrom.

Dekker has also written, produced and self-published online his three electronica albums.

Dekker was born in Las Vegas, Nevada. His mother, Hilary (née Williams), is a concert pianist, acting coach, actor, and singer from Wales, and his late father, David John Ellis Dekker, was an American artist, set designer, opera singer, and actor^[1][2] of English and Dutch ancestry.^[3][4][5] His maternal grandfather was Alun Williams, a radio broadcaster for the British Broadcasting Corporation.^[6] As a child, he and his parents moved all over the world, including his mother's native United Kingdom and Canada.^[7]

Dekker was brought up with a musical background, and started writing music at age ten while living in Canada. At the age of fifteen he landed a record deal; however after feeling that he wasn't as involved in the music as he would have liked, he left to concentrate on making his own music. At the age of sixteen, Dekker started writing and producing his own classical music influenced by electronica which he describes as "electrofolk". His debut album Psyanotic^[13] was released in 2008.^[14]

Dekker has stated that for much of his childhood, he was a victim of sexual molestation.^[15] In his teenage years, he was part of a "metalhead" subculture, where he "caused trouble in Las Vegas," and was arrested "five or six times."^[15]

Dekker was involved in an auto accident on October 15, 2009, when he hit a 17-year-old cyclist training for a race on a freeway onramp.^[16][17] Originally charged with two counts of felony DUI, the charge was reduced to one count of misdemeanor reckless driving when it was found that the cyclist was at fault. He pleaded no contest, and was sentenced to a fine of $300 and two years of informal probation, and ordered to attend a 12-hour alcohol-education class.^[18]

Dekker is a vegan.^{[19][20][21][22]}

On April 20, 2011, in an interview with Out magazine Dekker spoke about his sexuality, which had been the subject of speculation:

I've only really had relationships with women, but I'm certainly not closed to it. If there are possibilities of being able to do anything in life, why would you say you would never take any up? In the later chunk of my teen years I was so all over the place with sex. It was terrible. I never really had a real relationship at all. During puberty, it's all about sex, and it's all about figuring yourself out. I think I overdid it when I was younger.^[23]

On July 13, 2017, Dekker came out as gay and revealed that he married Canadian actor Jesse Haddock in April that year.^[24][25][26]

• Young Artist Award  — Best Performance in a TV Comedy Series — Leading Young Actor (Honey, I Shrunk the Kids: The TV Show) (1997)
• Young Artist Award  — Best Performance in a Voice-Over: TV/Film/Video — Young Actor (An American Tail: The Mystery of the Night Monster) (1999)
• Young Artist Award  — Best Performance in a TV Series — Guest Starring Young Actor (Boston Public) (2000)
• Young Artist Award  — Best Performance in a Voice-Over Role (The Land Before Time IX: Journey to the Big Water) (2002)