Ada Charlotte Mackenzie (October 30, 1891 – January 25, 1973) was a Canadian golfer who founded the Ladies Golf Club of Toronto in 1924.

At Havergal, Mackenzie played various sports including cricket and tennis and was the college's top athlete three years in a row.

She bought the land in what is now Markham, Ontario posing as a married person as there were restrictions on women buying land in Ontario at that time, then worked with famed course architect Stanley Thompson to plan the layout.

Her first tournament win was at the Canadian Women's Amateur in 1919, which she won five times throughout her career.

Mackenzie's last golf tournament win was at the Ontario Senior Women's Amateur in 1969.