Mary Elizabeth Mohler (née DeScenza, born September 17, 1984) is an American former competition swimmer and former world record-holder in the Women's 200-meter butterfly (long course).

[7] Mohler swam the butterfly leg of the 4x100 medley relay in the 2001 World Aquatics Championships in Fukuoka, Japan, winning her first international medal, a silver.

She was a four-time NCAA champion in the 200 yard butterfly from 2003 to 2006 - only the second time a swimmer had done so, behind Mary T. Meagher.

She won the 2005–06 Honda Sports Award for Swimming and Diving, recognizing her as the outstanding college female swimmer of the year.

[10] In 2004, Mohler qualified for the U.S. Olympic Swim Trials, but did not make the team, coming in fourth in the 200m butterfly with a time of 2:10.89.

The gold medalist, Australian swimmer Jessicah Schipper, broke Mohler's world record with a time of 2:03.41.

She attended Rosary High School in Aurora, Illinois, and graduated from the University of Georgia in 2007 with a Bachelor of Science in Biology.

Mohler's collegiate swimming career reached its peak as she became a four-time NCAA champion in the 200 butterfly.

[23] Mohler's former American record time of 2:04.14 in the 200m butterfly was broken on June 4, 2023 by Regan Smith.