Frederike Johanna Maria "Femke" Heemskerk (Dutch pronunciation: [ˈfɛmkə ˈɦeːmskɛrk]; born 21 September 1987) is a Dutch competitive swimmer who mainly specializes in freestyle, but also has a strong backstroke and medley.

As part of the Dutch team, she holds the short course world records in the 4 × 50 m freestyle relay, 4 × 100 m freestyle relay, and 4×200 m freestyle relay, all set in Doha in 2014. Individually she is owner of six national records, four in long course, 100 m and 200 m freestyle, 100 m backstroke, and 200 m individual medley, and two in short course, 200 m freestyle and 200 m individual medley.

Femke Heemskerk has been one of the best sprinters in Europe in the last decade.

Femke Heemskerk made her international debut at the World LC Championships 2005 in Montreal as a relay-swimmer. She only swum in the heats of the 4×100 m freestyle and the 4×200 m freestyle events. She competed in the European LC Championships 2006 and the European Short Course Swimming Championships. But individually she did not advance past the heats in both events.

At the World LC Championships 2007 she won a bronze medal in the 4×100 m freestyle together with Inge Dekker, Ranomi Kromowidjojo and Marleen Veldhuis. At the 2007 European Short Course Swimming Championships in Debrecen she surprisingly finished 6th in her first international final, the 100 m freestyle. She also finished 10th in the 200 m freestyle.

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