The sixth man in basketball is a player who is not a starter but comes off the bench much more often than other reserves, often being the first player to be substituted in. The sixth man often plays minutes equal to or exceeding some of the starters and posts similar statistics. He is often a player who can play multiple positions, hence his utility in substituting often. For example, Kevin McHale, a famous sixth man who played for the Boston Celtics in the 1980s, variably played center and power forward. The presence of a good sixth man is often a sign of team excellence. It usually means that a team has excellent depth, as the sixth man is usually more than talented enough to start for most teams.

The National Basketball Association's Sixth Man of the Year Award is an annual National Basketball Association (NBA) award given since the 1982–83 NBA season to the league's best performing player for his team coming off the bench as a substitute (or sixth man). A panel of sportswriters and broadcasters from throughout the United States and Canada votes on the recipient. Each judge casts a vote for first, second and third place selections. Each first-place vote is worth five points; each second-place vote is worth three points; and each third-place vote is worth one point. The player with the highest point total, regardless of the number of first-place votes, wins the award. To be eligible for the award, a player must come off the bench in more games than he starts.