Grinnell is a surname, originally of locational or topographical origin.

Notable people with the surname include:

Claudia Grinnell, British organist and choir director Claudia Kreuzig Grinnell, German expatriate, English professor and poet Frederick Grinnell (1836–1905), American engineer Frederick Grinnell (biologist) (born 1945), American biologist George Bird Grinnell, (1849–1938), American anthropologist, historian, naturalist, and writer George Blake Grinnell (1823–1891), American merchant and financier Henry Grinnell (1799–1874), American merchant, financier of Arctic explorations Henry Walton Grinnell (1843–1920), American admiral, son of Henry Grinnell Joseph Grinnell (1877–1939), American zoologist Josiah Bushnell Grinnell (1821–1891), U.S. congressman Katherine Van Allen Grinnell (1839-1917), American lecturer, author, reformer Moses H. Grinnell (1803–1877), U.S. Navy officer and U.S. Representative from New York William Morton Grinnell (1857–1906), U.S. diplomat & banker Elizabeth Grinnell (1851–1935), American writer, clubwoman, and naturalist

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