Piper Marten Ritter (born April 7, 1983) is an American, former collegiate softball pitcher and current head coach at Minnesota. Ritter played college softball at Minnesota from 2001 to 2004, and was named a four-time All-Big Ten Conference honoree. She is the school's career leader in WHIP. Ritter was undrafted and played one season in the National Pro Fastpitch in 2005 with the defunct Texas Thunder.