Joe Brier (born 16 March 1999) is a Welsh track and field sprinter who specialises in the 400 metres. He has won medals with the British 4 × 400 metres relay team, including bronze at the World Athletics U20 Championships in 2018, silver at the 2019 European Athletics U23 Championships and bronze at the 2021 European Athletics Indoor Championships. His sister, Hannah Brier, is also a British sprint athlete.