Ernest S. Brown (September 25, 1903 – July 23, 1965) served briefly as a United States senator from Nevada in 1954.

Ernest Spargur Brown, born in Alturas, California, moved with his family to Reno, Nevada, in 1906, where he later attended the public schools.

Brown studied law at night while still in college, gained admission to the bar in 1927, then commenced a legal practice in Reno.

A longtime member of the military reserves, he resigned from office in 1942 to enter active service in the United States Army as a major.

Democrat Alan Bible defeated him in a special election to keep his Senate seat in November 1954.