Edna Bertha Rankin McKinnon (October 21, 1893 – April 5, 1978) was an American social activist for birth control.

[7] After meeting Margaret Sanger, she was encouraged to become a field worker in Montana to inform women about birth control.

[1] From 1937 until 1946, she travelled across the United States to spread the word of birth control as a member of the Margaret Sanger Research Bureau.

[8] Rankin McKinnon soon resigned from the Margaret Sanger Research Bureau due to a dislike for new management.

[1] Gamble offered McKinnon $50 to set up a birth control clinic, which she successfully started, and formed a Planned Parenthood branch in Bali.