Margaret Cairns Munns (1870–1957) was an American pioneer school teacher of Washington State and a temperance reformer.

[1] Closely allied to her contribution to the work of the WCTU was the interest which Munns manifested in parliamentary procedure.

[1][2] Shortly after leaving college, Cairns became a member of the West Washington WCTU, affiliating herself with the Snohomish branch.

[1] She taught the WCTU members the art of extemporaneous speech and was the authority for the correct uses of parliamentary practice.

In 1899, she made her home in West Washington, setting in Seattle, after the death of her husband.

[1] In 1915, when she was elected treasurer of the National WCTU, she immediately went to Evanston, Illinois to take up her duties as one of the resident general officers.

[2] Her lectures included addresses on various phases of prohibition and expositions on parliamentary law.