Sun Young Yoo (Korean 허미정) (born December 13, 1986) is a South Korean female professional golfer.

Yoo had a distinguished amateur career. In 2001 she won the Korean Junior Golf Championship. She played on the Korean National Golf team in both 2002 and 2004. In 2004 Yoo won the Korean Amateur in addition to being a quarter-finalist at the United States Women's Amateur Golf Championship.

Yoo turned professional in November 2004 and began playing the Futures Tour in 2005. Yoo won her first professional event, the Betty Puskar Golf Classic. That and ten top ten finishes in 18 events allowed Yoo to begin playing the LPGA Tour in 2006.