Marc Peter Tierney (born 23 August 1985) is an English former professional footballer who played as a left back most recently for Football League Championship club Bolton Wanderers.
Predominantly a left back, Tierney could play in other positions, such as centre-back.
His brother Paul is also a retired professional footballer.
A graduate of the Oldham Athletic Academy where he made his debut in 2003, he has also played for Carlisle United, Shrewsbury Town, Colchester United, and Norwich City.