Matthias Farley (born July 15, 1992) is an American football safety for the Indianapolis Colts of the National Football League (NFL).  He played college football at Notre Dame. Farley was signed by the Arizona Cardinals as an undrafted free agent in 2016. 
Farley played in 52 games (26 starts) in four seasons at Notre Dame and recorded 192 tackles, 9.5 tackles for loss, 3.5 sacks, 8 interceptions, 13 passes defensed and one forced fumble. He began his collegiate career as a wide receiver and redshirted in 2011. He moved to safety in 2012 and started a career-high 11-of-13 games in his first year on defense as he finished with 49 tackles, 2.0 tackles for loss and one interception. He helped Notre Dame finish the regular season 12-0 and earn a spot in the BCS National Championship Game. Played in 13 games (eight starts) in 2013 and recorded 49 tackles, two interceptions and five passes defensed. Competed in 13 games (four starts) in 2014 and set career highs with 53 tackles, 6.5 tackles for loss, 3.5 sacks, four interceptions and five passes defensed. His four interceptions tied for the team lead and he ranked second on the team in sacks. Appeared in 13 games (three starts) as a senior in 2015 and collected 41 tackles, one forced fumble, one interception and two passes defensed.
Farley was signed by the Cardinals on May 2, 2016 as an undrafted free agent. He was waived by the Cardinals on September 3, 2016 as part of final roster cuts. 
On September 4, 2016, Farley was claimed off waivers by the Colts.