Marcus Cooper Walz (born 3 October 1994) is a sprint canoeist. Born in England, he has competed internationally for Spain since the early 2010s. He won the gold medal in the K-1 1000 metres event at the 2016 Summer Olympics in Rio de Janeiro. He won the silver medal in the Men's K-4 500 metres event at the 2020 Summer Olympics in Tokyo with Saúl Craviotto, Carlos Arévalo and Rodrigo Germade.
Born in Oxford to an English father and a German mother, the family established in Mallorca when Cooper was 3 months old. Walz became a Spanish national in 2015. On 26 June 2024, the Spanish Olympic Committee selected Cooper, together with the Olympic boat driver Támara Echegoyen, as the flag bearers for París 2024.
Cooper competed as Marcus Walz until 2022.
Canoe Sprint Olympics Bronze - K-4 500m 2024 Spain Canoe Sprint | Canoe Sprint Olympics Silver - K-4 500m 2020 Spain Canoe Sprint | Canoe Sprint Olympics Gold - K-1 1000m 2016 Spain Canoe Sprint |