Jack Grimmer (born 25 January 1994) is a Scottish professional footballer who most currently plays as a defender for League One club Wycombe Wanderers.
A Scotland under-21 international, he began his career at Aberdeen, becoming the club's youngest ever player at the age of 16. He was sold to Fulham in January 2012 and has since been loaned out to Port Vale and Shrewsbury Town (in three separate spells). He signed with Coventry City in July 2017, and went on to be named in the EFL League Two PFA Team of the Year for the 2017–18 season as Coventry won promotion via the play-offs.
Grimmer made his debut for Aberdeen under Mark McGhee on 7 April 2010, becoming the youngest ever Aberdeen player when he came on as a substitute for Steven MacLean in a 3–1 defeat to Rangers at Ibrox at the age of 16 years, 2 months and 13 days. Four days later he made his Pittodrie debut in a 3–1 defeat to St Johnstone.