William Wynne (born January 30, 1990) is an American hurdler who specializes in the 400 metre hurdles.

He currently holds the world youth best in the 400 m hurdles (84 cm) with a time of 49.01 seconds,[1] 0.85 seconds under the previous record set by South Africa's Marnus Kritzinger in 1999.

He won two gold medals and a silver medal at the 2007 World Youth Championships in Athletics, which also earned him the 2007 USATF Youth Athlete of the Year award.

[2] Wynne is a graduate of McEachern High School in Powder Springs, Georgia.

This biographical article about an American sprinter is a stub.