Jonas Ems (born 26 August 1986) is a German sprint canoer who has competed since the mid-2000s.

He has won four medals at the ICF Canoe Sprint World Championships with a gold (K-1 200 m: 2007), two silvers (K-1 4 × 200 m: 2009, K-4 200 m: 2005) and a bronze (K-2 200 m: 2013).

Ems also competed at the 2008 Summer Olympics in Beijing in the K-1 500 m event, but was eliminated in the semifinals.

At the 2012 Summer Olympics, he and Ronald Rauhe reached the final of the K-2 200 m event.

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