Leila Gay Forbes Clark (1887-1964) was an entomologist and librarian at the Smithsonian Institution.

[1] Prior to her work at the Smithsonian, she worked as a librarian at Wellesley College, Randolph-Macon Woman's College, and the US Department of Agriculture.

[2] She joined the Smithsonian in 1929 and spent the rest of her career there becoming director in 1942.

A new form of golden banded-skipper, Autochton cellus leilae, was named for her by her husband.

[4] Clark was born in Canton, New York to Henry Prentiss Forbes and Harriet E.