Ryan Edwin Diem (born July 1, 1979) is a former American football offensive lineman who played his entire professional career for the Indianapolis Colts of the National Football League.
Diem was born in Roselle, Illinois, played college football at Northern Illinois, and was drafted by the Colts in the fourth round of the 2001 NFL Draft.
Diem played for the Colts from 2001 to 2011 and was part of the Super Bowl XLI championship team that beat the Chicago Bears.