Charles Otis Waller (January 19, 1935 – August 18, 2004) was the lead singer and guitarist for the bluegrass band The Country Gentlemen. Waller was involved with The Country Gentlemen for 47 years. As a member of The Country Gentlemen, Waller was inducted into the International Bluegrass Music Hall of Honor in 1996 and the Southern Gospel Museum and Hall of Fame in 2009.
Waller with John Duffey, Eddie Adcock, and Tom Gray, all members of the Country Gentlemen during the 1960s.