Oliver Henry Wynne-Griffith (born 29 May 1994) is a British rower.

Wynne-Griffith won a bronze medal at the 2018 World Rowing Championships in Plovdiv, Bulgaria, as part of the eight with James Rudkin, Alan Sinclair, Tom Ransley, Thomas George, Moe Sbihi, Matthew Tarrant, Will Satch and Henry Fieldman.

[1] The following year he won another bronze medal at the 2019 World Rowing Championships in Ottensheim, Austria as part of the eight with George, Rudkin, Josh Bugajski, Sbihi, Jacob Dawson, Tarrant Thomas Ford and Fieldman.

[6] The following year in 2023, he repeated the silver success at the 2023 European Rowing Championships and then followed this up with another silver at the 2023 World Rowing Championships in Belgrade, behind the same Swiss pair.

[7] At the 2024 Paris Olympics, Ollie finished 2nd in the men's pair with Tom George, losing to Croatia in the last few strokes.