Allan's interests included education, science, culture and art. He was the most important patron of the artist, Paul Kane, enabling him to live a life as a professional artist, and presided over such bodies as the Royal Canadian Institute, the Ontario Society of Artists, the Toronto Conservatory of Music and the Ontario Historical Society. He served as chancellor of Trinity College. He donated to the city of Toronto a piece of land which formed the nucleus of Allan Gardens. He was also active in the Synod of the Church of England and was president of the Upper Canada Bible Society. He died in 1901, aged 79, at his residence, Moss Park, in Toronto.