Oliver Klemet (born March 18, 2002) is a German open water swimmer.

He won gold medal in the 4 x 1.5 km relay with Boy, Beck and Wellbrock at the 2022 World Swimming Championships in Budapest, Hungary.

[1] In July 2023, Klemet won the bronze medal in the ten-kilometer open water event at the World Aquatics Championships in Fukuoka.

[2] At the 2024 Summer Olympics in Paris, France, Klemet won the silver medal in the 10 km Open Water event.