Sophia Lonsdale (1852-1936) was a British philanthropist and social activist. Lonsdale was the daughter of John Gylby, canon of Lichfield, and the granddaughter of Anglican bishop John Lonsdale. A vocal anti-suffragist, Lonsdale's name appeared on the list of signatories to "A Woman's Protest Against Female Suffrage" published in The Nineteenth Century in 1889. Lonsdale was an early organizing member of the Women's National Anti-Suffrage League and part of the group's executive committee together with Mary Ward. Her letter published in The Times in 1907 encouraged readers to sign a petition against the woman's vote, which was presented to Parliament after collecting 37,000 signatures.