Frank Elmore Ross (April 2, 1874 – September 21, 1960) was an American astronomer and physicist.
When working for Eastman Kodak he investigated photographic emulsions and the design of wide-angle lenses for astronomical use.
During the opposition of Mars in 1926 he photographed the planet in different colors, using the Mount Wilson 60-inch telescope.
The following year he obtained ultraviolet pictures of Venus, which showed structure in its cloud cover for the first time.
In 1935, he published an article describing the design of a two-lens system to correct for the coma aberration of parabolic mirrors, including those at the 60-inch and 100-inch telescopes at Mount Wilson Observatory.