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This is a list of all personnel changes for the 1956 NBA off-season and 1956–57 NBA season.

• The Rochester Royals signed Lew Hitch as a free agent.

• The Boston Celtics claimed Andy Phillip on waivers from the Fort Wayne Pistons.

• The St. Louis Hawks signed Irv Bemoras as a free agent.

• The Syracuse Nationals sold Billy Kenville to the Fort Wayne Pistons.

• The Syracuse Nationals sold Red Rocha to the Fort Wayne Pistons.

• The Minneapolis Lakers sold Al Bianchi to the Syracuse Nationals.

• The New York Knicks traded Walter Dukes and Burdette Haldorson to the Minneapolis Lakers for Jerry Bird, Phil Jordon and Slater Martin.

• The Syracuse Nationals signed Larry Hennessy as a free agent.
• The Syracuse Nationals signed Bob Schafer as a free agent.
• The St. Louis Hawks claimed Odie Spears on waivers from the Fort Wayne Pistons.

• The Boston Celtics sold Togo Palazzi to the Syracuse Nationals.

• The St. Louis Hawks sold Bob Harrison to the Syracuse Nationals.

• The St. Louis Hawks traded Willie Naulls to the New York Knicks for Slater Martin.
• The Fort Wayne Pistons released Alex Hannum.

• The St. Louis Hawks signed Alex Hannum as a free agent.

• The Rochester Royals sold Lew Hitch to the Philadelphia Warriors.

• The St. Louis Hawks fired Red Holzman as head coach.

• The St. Louis Hawks appointed Slater Martin as head coach.

• The St. Louis Hawks hired Alex Hannum as head coach.

• The New York Knicks traded Dick Atha, Nathaniel Clifton and Harry Gallatin to the Fort Wayne Pistons for Mel Hutchins and Charlie Tyra.
• The New York Knicks traded Dick McGuire to the Fort Wayne Pistons for a 1958 1st round draft pick (Mike Farmer was later selected).

• The Minneapolis Lakers traded Clyde Lovellette and Jim Paxson to the Rochester Royals for Bob Burrow, Ed Fleming, Hot Rod Hundley, Monk Meineke and Art Spoelstra.

• The Fort Wayne Pistons traded Corky Devlin to the Minneapolis Lakers for Ed Kalafat.

• The Minneapolis Lakers reassigned Head Coach John Kundla.
• The Minneapolis Lakers hired George Mikan as head coach.

• ^a Number of years played in the NBA prior to the draft
• ^b Career with the franchise that drafted the player
• ^c Never played a game for the franchise

• NBA Transactions at NBA.com
• 1956-57 NBA Transactions| Basketball-Reference.com