Jakob Thordsen (born 1999 in Hamburg) is a German sprint canoeist.

He won a gold medal in K-4 1000m at the 2018 ICF Canoe Sprint World Championships[1] and the 2019 ICF Canoe Sprint World Championships, and a bronze medal in the K-1 1000m at the 2023 ICF Canoe Sprint World Championships.

He finished 8th in the K-1 1000m at the 2024 Summer Olympics.

[2] As a career outside sport, he has learnt and works as a mechatronics technician.

[3] Thordsen moved from Hamburg to a sports boarding school in Hannover in 2014.