Mary Pellatt, Lady Pellatt (née Dodgson; 1857–1924), was the first wife of Sir Henry Pellatt and served as the first Chief Commissioner of the Girl Guides of Canada. She was awarded the Silver Fish Award in 1922.
She was born on April 16, 1857, in Toronto, Canada. On June 15, 1882, she married Henry Mill Pellatt, who was knighted in 1905 by King Edward VII. She was educated at Bishop Strachan School, an Anglican all-girls school in Toronto.
She was created Chief Commissioner of the Dominion of Canada Girl Guides on July 24, 1912. As early as 1913, she invited Guides to view her palatial home, Casa Loma. Guides became frequent visitors to the house and its grounds.
Lady Pellatt also planned trips for the Guides to her country home, Mary Lake Farm, in King, Ontario. She resigned her position in 1921 because of ill health. In 1922, Lady Pellatt was presented with the Silver Fish Award.
She died suddenly of heart failure on April 24, 1924. The Girl Guides formed a Guard of Honour for her funeral at St. James' Cathedral in Toronto. She was buried in her Girl Guide uniform in King, Ontario.