Charles Ladd "Ren" Thomas (1895 – August 1955) was an American football and basketball coach and professor.
He served as the head football coach at Nebraska Wesleyan University from 1925 to 1926, compiling a record of 12–4–2.
Dow was also the head basketball coach at Nebraska Wesleyan from 1924 to 1930, tallying a mark of 40–55.
A native of Cattaraugus, New York, Dow taught at Clarion State Teachers College—now known as Clarion University of Pennsylvania—before becoming chair of the department of geology and geography at Ohio University.
He died in August 1955 of a heart attack while returning from Japan aboard a Japanese ship.