Frank Putnam Flint (July 15, 1862 – February 11, 1929) was a United States senator from California from 1905 to 1911.

[1] In 1888 or 1890, he was appointed a clerk in the United States marshal's office in Los Angeles, and began to study law.

In 1892 he was appointed assistant United States attorney under Mathew Thompson Allen.

In 1897 Flint was appointed United States attorney for the southern district of California, and served four years.

He attended the Presbyterian church, was a trustee of Occidental College, a director of two banks (Equitable Savings, Los Angeles National).

As a senator from California, he played a great part in making the Mission style the official architectural style of government buildings in Southern California[citation needed] and played a major political role in bringing Owens Valley water to metropolitan Los Angeles.