Thomas Keiser (born March 28, 1989) is a former American football linebacker.

[1] Keiser was signed by the Carolina Panthers as an undrafted free agent on July 30, 2011.

Keiser proved to be a physical linebacker, playing 12 games, while starting 3, collecting 21 tackles, 4.5 sacks, and an interception.

Keiser intercepted Peyton Manning in week 15 to seal the game and win for the chargers.

Keiser was assigned to the San Jose SaberCats of the Arena Football League (AFL) on December 3, 2014.