Ada Gladys Killins (1901 – 1963) was a Canadian artist and educator. The daughter of Robert Killins and Rachel Swick, she was born in Castor township, Lincoln County, Ontario. She attended teacher's college and began teaching art at Memorial School in Niagara Falls in 1924. For a number of years, she took art classes in summer at the Ontario College of Art. She also took private lessons with Franz Johnston and later took summer classes with Carl Schaefer on Lake Couchiching between 1935 and 1938. In 1947, she retired from teaching to paint full-time, moving into a cabin near Orangeville.