Sean David Runyan (born June 21, 1974) is a former Major League Baseball player.

He would be used as a left-handed specialist out of the Tigers bullpen, and would go on to lead the American League in appearances with 88.

On July 11, 1998, Runyan pitched 1 1/3 innings to close out a 5-2 Tigers victory over the Blue Jays.

[5] After dealing with arm troubles, Runyan pitched his final game on September 9, 2000.

This biographical article relating to an American baseball pitcher born in the 1970s is a stub.