Frank Leslie Coombs (December 27, 1853 – October 5, 1934) was an American lawyer and politician who served one term as a congressman from California from 1901 to 1903.

Coombs was admitted to the bar in 1875 and commenced practice in Napa.

On the death of John F. Swift, he was appointed United States Minister to Japan and served from June 1892 to August 1893.

Coombs was the United States Attorney for the Northern District of California from April 1, 1899, to March 1, 1901.

He died in Napa at age 80, and was buried in Tulocay Cemetery.