Urgel "Slim" Wintermute (born July 9, 1917 – presumed dead October 1977) was an American collegiate and professional basketball player.

Born in Portland, Oregon, Wintermute attended high school in Longview, Washington.^[1] A mobile 6-foot-8-inch (2.03 m) center, Wintermute was a key member of the 1938–39 Oregon Ducks men's basketball team, winners of the first NCAA Tournament championship. Wintermute was voted first-team All-Pacific Coast Conference and named an All-American in 1939.^[2] He was elected to the University of Oregon Athletic Hall of Fame in 1994 and is one of six Ducks whose numbers have been retired.^[3]

Wintermute played professionally for the Detroit Eagles of the National Basketball League.^[2] He also served as player/coach for the Portland Indians of the Pacific Coast Professional Basketball League.^[2][4]

Following his basketball career, Wintermute worked for Boeing.^[1] He was elected to the Oregon Sports Hall of Fame in 1980.^[3] On October 21, 1977, Wintermute set out in his yacht from Portage Bay in Seattle's Lake Union and did not return.^[5] His boat was found a few days later, with one of Wintermute's friends asleep on the boat who claimed that Slim was still alive when he went to sleep. Wintermute was never found.

• List of people who disappeared at sea