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.

• National Register of Historic Places listings in Columbia County, Arkansas
• Cotter Water Tower
• Cotton Plant Water Tower
• Hampton Waterworks

• An Ambition to be Preferred: New Deal Recovery Efforts and Architecture in Arkansas, 1933-1943, By Holly Hope