| Biographical details | |
|---|---|
| Born | December 13, 1903 Baltimore, Maryland |
| Died | April 11, 1968 (aged 64) Baltimore, Maryland |
| Playing career | |
| 1925–1927 | Johns Hopkins |
| Coaching career (HC unless noted) | |
| 1935–1950 | Johns Hopkins |
| Head coaching record | |
| Overall | 68–31–1 |
| Accomplishments and honors | |
| Championships | |
| 1941, 1950 | |
William Kelso Morrill Sr. (December 13, 1903 – April 11, 1968) was a college lacrosse player and coach. He served as the head lacrosse coach at his alma mater, Johns Hopkins University from 1935 to 1950, where he won two Wingate Memorial trophies representing the National lacrosse title. Morrill also served as an executive and head of official for the United States Intercollegiate Lacrosse Association. He was inducted into the National Lacrosse Hall of Fame in 1978. He was "one of the finest early innovators of the college game".[1]