Frederike Johanna Maria "Femke" Heemskerk (pronounced [freːdəˈrikə joːˈɦɑnaː maːˈrijaː ˈfɛmkə ˈɦeːmskɛr(ə)k]; born 21 September 1987) is a former Dutch competitive swimmer[2] who mainly specializes in freestyle, but also has a strong backstroke and medley.

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.

The next month she competed in Manchester at the World SC Championships 2008 where she again broke two relay records in the 4×200 m freestyle with the same team as in Eindhoven.

At the end of 2008 she became Amsterdam Sportswoman of the year In 2011 Heemskerk won a gold medal at the 2011 World Aquatics Championships as part of the 4 × 100 m freestyle relay alongside Inge Dekker, Ranomi Kromowidjojo and Marleen Veldhuis in a time of 3:33.96.

At the 2012 Summer Olympics in London, Heemskerk and her teammates – Ranomi Kromowidjojo, Inge Dekker, Marleen Veldhuis, and Hinkelien Schreuder – won a silver medal in the 4 × 100 m freestyle relay, an event in which they were the defending champions.

[6] After finishing outside the medals in her individual events (the 100 and 200 meter freestyle) at the 2015 World Aquatics Championships in Kazan, Heemskerk decided to move to France to train with coach Philippe Lucas.

In the Swim Cup Eindhoven, Heemskerk won the 200 m freestyle event with a time of 1:56.62, securing a place for Budapest.

In the 100 m freestyle event Heemskerk reached the finals and finished second with a time of 53.77, securing qualification for the Budapest championships.