Calhoun County Library is a historic library building located at St. Matthews, Calhoun County, South Carolina. It was built about 1877, and is a one-story, medium-gabled white clapboard structure in the Greek Revival style. It was originally built as a residence, but was adapted for use as a county library in 1949. The front façade features a three-bay, square-columned entrance porch, with smaller porches of similar design on the flanking wings. The library is one of St. Matthews' oldest buildings.