Dame Diana Margaret Ellis (11 April 1938 – 18 May 2017), known as Di Ellis, was a British rower and the former Honorary President of British Rowing.
Competitively, she rowed for Great Britain in 1966, as part of the women’s eight at the European championships, coxed the England women's four to gold in the 1972 home countries match, and won the women's eights head of the river race seven times, four as a cox and three as a rower, from 1966-1973.
She was also the first national champion in 1972 on the new 2,000-metre course at Holme Pierrepont.