Matthew Arthur Grootegoed (born May 6, 1982) is a former American college and professional football player who was a linebacker in the National Football League (NFL) and Canadian Football League (CFL). He played college football for the University of Southern California, and was recognized as an All-American. He was signed by the NFL's Detroit Lions as an undrafted free agent in 2005, and also played for the CFL's Calgary Stampeders in 2009.