The Waldo water tower is a historic elevated steel water tower located in Waldo, Arkansas, United States, that is listed on the National Register of Historic Places.

The tower was completed in 1936 by the Pittsburgh-Des Moines Steel Company in conjunction with the Public Works Administration as part of a project to improve the town's water supply.

It was added to the National Register of Historic Places in 2007, as part of a multiple-property listing that included numerous other New Deal-era projects throughout Arkansas.

The tower is still in operation as part of the town's water supply system.

This article about a property in Columbia County, Arkansas on the National Register of Historic Places is a stub.