The Argenta Branch Library is a branch of the public library system of North Little Rock, Arkansas. It is located at 420 North Main Street, in the former North Little Rock Post Office building, a brick Georgian Revival building constructed in 1931 to a design by the noted Arkansas architect Charles L. Thompson. It was used as a post office until 2011, and was opened as a branch library in 2014.The building was listed on the National Register of Historic Places in 1982.