Eva Margaret Gilpin, known as Lady Sadler upon her marriage, (25 March 1868 – 23 September 1940) was a British headmistress and educationist.

Her Quaker parents were Margaret (born Binns) and Edmund Octavius Gilpin.

[1] She was given a Quaker education at Ackworth School where there was learning tracts and the art classes concentrated on the means of production.

[1] She was a teacher in London but she left that to go to Yorkshire in 1892 where she was to be the governess of five of William and Anna Harvey's children in Ilkley.

Her class expanded when Michael Sadler came to visit and he and his wife, Mary, decided to leave their son under her care during term time.