Arthur C. "Dutch" Lonborg (March 16, 1898 – January 31, 1985) was a basketball, American football and baseball player, coach, and college athletics administrator.

The Gardner, Illinois native coached for 23 years at McPherson College, Washburn College, and Northwestern University. Lonborg graduated in 1921 from University of Kansas, having played two years under coach Phog Allen.

In 1921 Dutch won an Amateur Athletic Union (AAU) title as a player with the Kansas City Athletic Club Blue Diamonds. In 1925 he coached Washburn College to an AAU title, the last time a college team won that championship. Later he coached at Northwestern, getting 237 wins during his time there, and leading them to Big Ten Conference championships in 1931 and 1933. His 1930–31 team finished the season with a 16–1 record^[1] and was retroactively named the national champion by the Helms Athletic Foundation and the Premo-Porretta Power Poll.^[2][3] He had an overall 323–217 college coaching record at all three schools.

After he retired from coaching, he became chairman of the NCAA Tournament Committee from 1947 to 1960, succeeding Harold Olsen. He was the U.S. Olympic team manager for the 1960 Olympics. He also served as the Kansas Jayhawks athletic director from 1950 to 1963.

He was inducted into the Basketball Hall of Fame in 1973 as a coach.