Ulis C. Williams (born October 24, 1941) is an American former athlete, winner of a gold medal in the 4 × 400 meter relay at the 1964 Summer Olympics.
Born in Hollandale, Mississippi, Williams won the AAU championships in the 440-yard dash in 1962 and 1963. In 1962, he was named Track and Field News High School Athlete of the Year. After graduating Compton High School, Williams enrolled at Arizona State University and won the NCAA championships in 440 yd in 1963 and 400 m in 1964.
At the Tokyo Olympics, Williams was fifth in 400 m and ran the third leg on the American 4 × 400 m relay team that won the gold medal with a new world record of 3.00.7.