The 2011 World Series of Poker was the 42nd annual World Series of Poker (WSOP). The WSOP is the most prestigious poker tournament in the world with the winner of the Main Event considered to be the World Champion. It was held at the Rio All Suite Hotel and Casino in Las Vegas, Nevada between May 31 – July 19, 2011. There were 59 bracelet events, beginning with the WSOP National Circuit Championship and culminating in the $10,000 No Limit Hold'em Championship. The November Nine concept returned for a fourth consecutive year, with the Main Event finalists returning on November 6, playing down to three that evening and then adjourning until November 8.

The World Series of Poker (WSOP) is a series of poker tournaments held annually in Paradise, Nevada and, since 2004, sponsored by Caesars Entertainment. It dates its origins to 1970, when Benny Binion invited seven of the best-known poker players to the Horseshoe Casino for a single tournament, with a set start and stop time, and a winner determined by a secret ballot of the seven players.