Dominique Lorraine Diezi (born 14 July 1977) is a Swiss former swimmer who specialized in sprint freestyle events.

[2] Diezi made her first Swiss team at the 1996 Summer Olympics in Atlanta, where she finished thirty-second overall in the 50 m freestyle.

She qualified again for three events by clearing a FINA B-cut of 57.30 (100 m freestyle) from the World Championships in Barcelona, Spain.

[6][7] In the 100 m freestyle, Diezi topped the third heat with her personal best of 56.67, but shared a twenty-sixth place tie with Slovenia's Sara Isaković from the preliminaries.

[12][13] Diezi was also a varsity swimmer for the Northwestern Wildcats and an assistant coach SMU Mustangs respectively.