Sarah Elizabeth Pratt Grinnell (May 9, 1851 – July 6, 1935) was an American writer, clubwoman, and naturalist, based in Pasadena, California.

[3] Philanthropist Margaret Olivia Slocum Sage was a frequent visitor to Grinnell's home and a benefactor of the society's work.

[4] Grinnell provided photographs of birds to Vernon Lyman Kellogg for his textbook Elementary Zoology (1901).

Her work with the society extended beyond animal protection to the care of human orphans,[20] the prevention of child abuse,[21] and the promotion of film censorship for the "morality of the city's youth.

"She was a little grey-haired woman somewhat stooped, whose hair falling about her face and shoulders gave her an almost witch-like appearance as she went about clad in male attire," noted a local newspaper.