Thomas Dwan (born July 30, 1986 in Edison, New Jersey) is an American professional poker player who regularly plays online in the biggest No-Limit Texas hold 'em and Pot-Limit Omaha games, primarily on Full Tilt Poker, where he plays under the screen name "durrrr". In early November 2009, Dwan signed with Full Tilt and became a member of Team Full Tilt.

Dwan has cashed in the money in live tournaments and has appeared on NBC's National Heads-Up Poker Championship, the fourth season of Poker After Dark, the third season of Full Tilt Poker's Million Dollar Cash Game, and the fifth season of GSN's High Stakes Poker in which he won the show's largest cash pot to date -- the pot totaled $919,600 versus Barry Greenstein. He attended Boston University as an English major, before dropping out to pursue poker full time.

In March 2004 at the age of 17, Dwan began playing online poker at Paradise Poker with a $50 bankroll his father had given him for his 17th birthday. He believed the alias durrrr would put players on tilt if they lost to him. Dwan initially focused on $6 sit-and-go's and ended up losing $35. With his last $15 he continued to focus on these sit-and-gos until he was able to turn profit. After finding he could beat these games he turned to cash games where he built his bankroll starting at low stakes and slowly climbed his way to largest games found online. After beating multiplayer cash games Dwan switched his focus to playing heads up No Limit hold 'em with other professionals such as Frederick Halling at the 10/20 stakes. He challenged Prahlad Friedman at the 25/50 stakes and lost to him for several months forcing him to drop to lower stakes before coming back again and again until he was able to beat Friedman.

In January 2009 Dwan issued a $1,000,000 challenge to play online anybody excluding Phil Galfond, who plays under the tag OMGClayAiken, heads up for 50,000 hands 4-tabling 200/400 or higher No Limit Holdem or Pot Limit Omaha. If his opponent is ahead after 50,000 hands, Dwan agreed to give them $500,000 plus an additional $1,000,000. If Dwan is ahead he will get an additional $500,000. Phil Ivey has said that he is willing to accept the challenge. David Benyamine told CardPlayer magazine that he is still considering taking the challenge. Patrik Antonius officially accepted the challenge and is Dwan's first opponent. Regarding his challengers, Dwan has said, "I think all of them actually are better over-all poker players than me -- by quite a bit; I happen to think in this one area, I might have a little edge -- and we'll see if I do."

Dwan participated in the 2008 NBC National Heads-Up Poker Championship where in his first match he defeated Phil Hellmuth in the third hand of play when Dwan's pocket tens cracked Hellmuth's pocket aces when Dwan made a set on the turn. Dwan was eliminated in next round when he was defeated by Mike Matusow.  At the 2008 Five-Star World Poker Classic (the $25,500 WPT Championship) Dwan finished in ninth place, earning $184,670.