Ella Christina Jansen (born September 1, 2005) is a Canadian competitive swimmer specializing in freestyle, butterfly and individual medley events.

"[9] Jansen swam for the Canadian team in the heats of the 4×100 m mixed freestyle relay, helping them qualify to the final.

"[12] She also reached the final of the 400 m freestyle and placed seventh with a time of 4:10.69, stating that she had come up just short of her goal of going under the 4 minute and 10 second mark.

[14] In September 2022, Jansen moved to train at High Performance Center in Scarborough under Ryan Mallette and Rob Novak.

[14] At the 2023 Canadian trials, she succeeded in qualifying for the World team for the first time, earning assignments to the 2023 edition in Fukuoka.

[19][20][21] While many of Canada's top swimmers opted to skip the 2024 World Aquatics Championships in Doha, Jansen was named to the team.