Ryann Ashley O'Toole (born February 11, 1987) is an American female professional golfer currently playing on the LPGA Tour.
O'Toole turned professional in 2009, and joined the Futures Tour on February 1, 2009. She competed in eight events on ended the season 80th on the Futures Tour money list. O'Toole participated in the LPGA Final Qualifying Tournament ("Q-School") in December in an attempt to earn membership on the LPGA Tour for 2010, but finished 73rd and failed to qualify.
She started 2011 playing on the Futures Tour and in the events on the LPGA Tour that her relatively low priority status qualified her for. After a 9th-place finish at the U.S. Women's Open in Colorado Springs, her priority status improved, which gave her entry into more tournaments. After O'Toole finished tied for fifth at the Safeway Classic on August 21, U.S. Solheim team captain Rosie Jones named her one of two captain's picks for the 2011 Solheim Cup team.
She won her first LPGA Tour win on August 15, 2021, at the Ladies Scottish Open with a 271 (-17), by three strokes over both Lydia Ko and Atthaya Thitikul. It was her 11th season on tour and her 228th LPGA Tour start.