Ethan Christopher Calleja (born 2 December 1999) is an Australian synchronised swimmer.

[2] Together with Danielle Kettlewell he placed fifth in the mixed duet event at the 2019 FINA World Aquatic Championships.

Calleja and Kettlewell won the mixed duet event at the 2019 Hancock Prospecting Artistic Swimming Australian National Championships.

[9] They also reached the final of the mixed duet free routine event.

Calleja appeared in the documentary Treading Water, conducted by students at Edith Cowan University and directed by Corina Stagg.