Jenna Marie Gresdal (born September 19, 1984) is a Canadian former competitive swimmer who specialized in sprint freestyle events.

While studying in the United States, she earned six All-American honors for the University of Arizona at the NCAA Championships.

[5][6] She challenged seven other swimmers in heat ten, including Dutch rising star Inge de Bruijn and defending Olympic champion Amy Van Dyken.

She rounded out the field to last place in 26.79, just 2.33 seconds off an Olympic record, set by De Bruijn.

Gresdal failed to advance into the semifinals, as she placed thirty-eighth overall out of 74 swimmers in the prelims.