Harry Cecil Rowsell, OC (29 May 1921 – 3 February 2006) was a Canadian veterinarian, pathologist, animal welfare advocate and humanist.Born in Toronto, Ontario, he served as a Lieutenant in the Royal Canadian Navy during World War II. Upon his return, he received a Doctor of Veterinary Medicine from the Ontario Veterinary College in 1949, a D.V.P.H. from the University of Toronto in 1950, and a Ph.D. from the University of Minnesota in 1956. In 1946, he married Anne Bradshaw.