Lukas Märtens (born 27 December 2001)[1] is a German swimmer.

He is the reigning 400m freestyle Olympic champion.

Märtens competed at the Olympics in 2020 in the 200 metre freestlye, 400 metre freestyle, 1500 metre freestyle and 4 × 200 metre freestyle relay events,[1] and in 2024 where he won a gold medal in the 400 metre freestyle event[2] and came 5th in the 200 metre freestyle event.

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