Arnold Harrison II (born September 20, 1982) is an American former professional football linebacker.

Harrison played college football at the University of Georgia where he majored in economics.

Harrison was signed by the Pittsburgh Steelers as an undrafted free agent in 2005, but did not make any appearances for the team in his rookie season.

After spending the entire 2008 season on injured reserve with a torn ACL, Harrison was non-tendered as a restricted free agent in the 2009 offseason.

Harrison appeared in eight games and recorded seven tackles for the Steelers in 2009 before being waived on November 17 to make room for linebacker Donovan Woods.