Greensburg Carnegie Public Library, also known as Greensburg City Hall, is a historic Carnegie library located at Greensburg, Decatur County, Indiana. It was built in 1904, and is a one-story, cruciform plan, tan brick building in the Classical Revival style. It is topped by a red terra cotta tiled gable roof and central drum and saucer dome. It features a projecting front portico supported by paired Ionic order columns. Its construction and furnishing was funded by a $15,000 grant provided by Andrew Carnegie. It was added to the National Register of Historic Places in 1995.