The 1971 World Series of Poker (WSOP) was a series of pokertournaments held at Binion's Horseshoe during May 1–15, 1971. This was only the second installment of the World Series of Poker, but unlike at the 1970 event, freezeout tournaments were played to decide the winner of the main title. The freezeout structure replaced the cash games, and it was kept in use ever since. Five freezeouts were played in total—four preliminary events and the Main Event—each featuring a different poker variant. The preliminary events required player to put up a buy-in of $1,000, while the Main Event buy-in was $5,000.
There were 6 entrants to the main event, each paying $5,000 to enter the tournament. The game played was no limitTexas hold 'em. Johnny Moss won the tournament and took the whole prize pool. Moss's victory that year was the first time a player had been awarded the Main Event Championship two years in a row, a feat that would later be also accomplished by Doyle Brunson, Stu Ungar, and Johnny Chan.