Sean Ryan (born August 13, 1992) is an American competition swimmer who specializes in long-distance and open-water freestyle events.

He swam with the Scenic City Aquatic Club, a USA Swimming program, and The McCallie School, under coach Stan Corcoran.

2009 - 2011 At the 2009 Open Water Nationals, Ryan placed 4th overall and qualified for the 2009 World Aquatics Championships in Rome, Italy.

After a month of training with Jon Urbanchek out in Fullerton, California,] and a few weeks taper with coach Stan Corcoran, Ryan's work paid off with a third-place finish at U.S. Nationals right behind Peter Vanderkaay.

At Long Course Nationals in 2011 Ryan finished second in the 1500 freestyle to Gemmell in 15:01 and is currently the fourth fastest American in the event for 2011 and the 11th in the world.