Ewelina Ptak

Ewelina Ptak (born 20 March 1987) is a Polish track and field sprint athlete.

Klocek represented Poland at the 2008 Summer Olympics in Beijing. She competed at the 4x100 metres relay together with Daria Korczyńska, Dorota Jedrusinska and Marta Jeschke. In their first round heat they placed fifth behind Belgium, Great Britain, Brazil and Nigeria. Their time of 43.47 seconds was the second best non-directly qualifying time and the seventh time overall out of sixteen participating nations. With this result they qualified for the final in which they replaced Jeschke with Joanna Henryka Kocielnik. In the final they were eventually disqualified.

She was selected to represent Poland at the 2016 Summer Olympics in the women's 4 × 400 metres relay event.