Clinton Earl Portis (born September 1, 1981 in Laurel, Mississippi) is an American football running back for the Washington Redskins of the National Football League.

Portis was born to Rhonnel and Carson Portis. He has a brother named Earl who still resides in their home city.

Portis starred at the University of Miami. He was going to wear the highly traditional number five but turned it down for the number twenty eight. He considered going to the University of Florida but a fight that he had at Gainesville High School had his scholarship taken away. He became just the second true freshman to start at running back since the 1975 season. Portis set a school freshman record with five 100-yard performances, and led the team with 838 yards and eight touchdowns on 143 carries (5.9 avg.) in 10 games. He also caught four passes for 44 yards (11.0 avg.) and 2 touchdowns.