Dominique Lorraine Diezi (born 14 July 1977) is a Swiss former swimmer who specialized in sprint freestyle events.
She is a two-time Olympian (1996 and 2004), a 32-time Swiss national champion, a multiple-time record holder in sprint freestyle (50 and 100 m), and a member of Switzerland's national swimming team (1992–2004).
She also earned multiple All-American honors while studying in the United States.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 edged out Panama's Eileen Coparropa to lead the third heat by a tenth of a second (0.10) in 26.57.
As a member of the Swiss relay team, she also placed seventeenth in the 4×100 m freestyle (3:53.30), and sixteenth in the 4×200 m freestyle (8:21.55).Diezi sought her comeback at the 2004 Summer Olympics in Athens after an 8-year absence.
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.
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 Isakovic from the preliminaries.
She also helped out the Swiss team to pull off a fifteenth-place effort each in the 4×100 m freestyle (3:48.61), and in the 4×100 m medley (4:15.54).Diezi was also a varsity swimmer for the Northwestern Wildcats and an assistant coach SMU Mustangs respectively.
She graduated with a bachelor's degree in economics and international studies at Northwestern University in Evanston, Illinois (2001), and a master's degree in education at the Southern Methodist University in Dallas, Texas (2010).In 2011, Diezi was named women's assistant coach for the Yale Bulldogs swimming and diving team at Yale University.