Diana Farnham O'Hehir (May 23, 1922 – January 19, 2021) was an American poet and writer of prose from northern California.

She was born in Lexington in 1922, though she moved to California with her father the next year.

She taught from 1961 to 1992 at Mills College in Oakland where she was Aurelia Henry Reinhardt Professor Emerita of American Literature.

She outlived both husbands, and died at the age of 98 in 2021, having published five novels and five collections of poetry.

Though not the most prolific, her works have been highly regarded by critics, with several receiving awards.