Joseph Henry Thomas (March 18, 1921 – February 10, 1983) was a National Football League (NFL) general manager and also served as the head coach of the Baltimore Colts for part of the 1974 season.

Thomas arranged for Robert Irsay to purchase the Los Angeles Rams from the estate of Dan Reeves for $19 million before exchanging them for Carroll Rosenbloom's Baltimore Colts in an unprecedented transaction which was completed on July 13, 1972.

[12] When the Colts went 4–13 over parts of two seasons with Schnellenberger at the helm, Thomas was named to replace him by Irsay following a 30–10 loss to the Philadelphia Eagles at Veterans Stadium on September 29, 1974.

[16] Within the next ten days, Tom Matte would follow Unitas to San Diego, Bill Curry was sent to the Houston Oilers, Billy Newsome to the New Orleans Saints, Norm Bulaich to the Philadelphia Eagles and Jerry Logan to the Rams.

In that draft and the one the following year, Thomas would also select a pair of blind-side offensive linemen in David Taylor and Robert Pratt and an entire defensive line of Joe Ehrmann, Mike Barnes, John Dutton and Fred Cook.

[10] After the Colts qualified for the NFL playoffs by winning the AFC East title in each of two consecutive seasons in 1975 and 1976, Thomas lost a power struggle over player personnel decisions to head coach Ted Marchibroda and was fired by Irsay on January 21, 1977.

Thomas then was hired as GM of the San Francisco 49ers in 1977 by new owner Eddie DeBartolo at the recommendation of Al Davis and immediately fired head coach Monte Clark.

[22] According to longtime 49ers beat reporter Matt Maiocco, Thomas' attempt to annihilate the past and remake the 49ers in his own image included the destruction of historical memorabilia, with old photos, programs, and other artifacts disposed of en masse in a dumpster behind the team's Redwood City practice facility.