Luke Barrie Prosser (born 28 May 1988) is an English professional footballer who plays as a defender for EFL League Two club Stevenage.
A product of the Tottenham Hotspur youth academy, Prosser joined Port Vale in 2005. He spent five years at the club, also spending time on loan at Leigh RMI, Salisbury City, and Kidderminster Harriers. He moved on to Southend United in 2010, and was initially loaned out to Rushden & Diamonds. He played for Southend in the 2013 Football League Trophy Final and was an unused substitute in the 2015 League Two play-off final victory. He was loaned out to Northampton Town in January 2016, and helped the club to win promotion as League Two champions in 2015–16. After being released by Southend, he joined Essex rivals Colchester United for a four-year stay starting in June 2016. He signed for Stevenage in August 2020.