Ajna Evelin Késely (born 10 September 2001) is a Hungarian competitive swimmer who specialises in freestyle.

In 2014, she competed in all three individual backstroke events at the short course world championships in Doha, Qatar.

At the 2016 European Junior Championships in Hódmezővásárhely, Hungary, she won three individual gold medals, in the 200, 400, and 800 meter freestyle events.

At the 2017 European Junior Championships in Netanya, Israel, she won six gold medals, including four in individual freestyle events.

Respectively, as Anja continues to train hard and aim high, she will most certainly reach many more international platforms.