- August 5, 1958
The Cincinnati Royals traded Clyde Lovellette to the St. Louis Hawks for Wayne Embry, Jim Palmer, Darrell Floyd, Gerry Calvert and Ken Sidle. Lovellette was sent as player to be named later on September 16, 1958.
- September 12, 1958
The Philadelphia Warriors hired Al Cervi as Head Coach.
- November 20, 1958
The St. Louis Hawks fired Andy Phillip as Head Coach.
The St. Louis Hawks hired Ed Macauley as Head Coach.
- December 1, 1958
The Cincinnati Royals fired Bobby Wanzer as Head Coach.
The Cincinnati Royals hired Tom Marshall as Head Coach.
- December 16, 1958
The Cincinnati Royals traded Vern Hatton to the Philadelphia Warriors for Phil Rollins.
The Syracuse Nationals claimed George Dempsey on waivers from the Philadelphia Warriors.
- January 14, 1959
The Cincinnati Royals traded Si Green to the St. Louis Hawks for Med Park and Jack Stephens.
- January 27, 1959
The New York Knicks traded Guy Sparrow to the Philadelphia Warriors for Jack George.
- February 13, 1959
The Detroit Pistons traded George Yardley to the Syracuse Nationals for Ed Conlin.
- March 18, 1959
Al Cervi resigns as Head Coach for Philadelphia Warriors.
- March 31, 1959
The Cincinnati Royals traded Archie Dees and a 1959 2nd round draft pick (Tom Robitaille was later selected) to the Detroit Pistons for Phil Jordon.