The Monticello Post Office is a historic post office building at 211 West Gaines Street in Monticello, Arkansas. The single story brick Art Deco brick building was built in 1937. In 1941 a terra cotta sculpture by Berta Margoulies entitled "Tomato Sculpture" was installed in the building, which was funded in part by Section of Painting and Sculpture of the United States Department of the Treasury.The building was listed on the National Register of Historic Places in 1998.