Ryan Thomas O'Callaghan (born July 19, 1983) is an American former professional football offensive tackle.

[1] He played college football for the California Golden Bears and was selected by the New England Patriots in the fifth round of the 2006 NFL draft.

O'Callaghan was picked up off waivers by the Kansas City Chiefs on September 6, 2009, after being released by New England the previous day.

While at the University of California, Ryan won the Morris Trophy,[9] which is awarded annually to the most outstanding offensive lineman in the PAC 12 conference.

On December 20, 2014, O'Callaghan was inducted into the Shasta County Sports Hall of Fame along with several other athletes from Shasta County, California, such as Max Burch, Sam Enochian, Jeff Foster, Ricky Ray, Megan Rapinoe, Eddie Wilson, and Mark Wilson.