Cairo Skywatch Tower, also known as Delta Lima 3 Green Ground Observation Tower, is a historic watchtower located in Tippecanoe Township, Tippecanoe County, Indiana.

It was the first officially commissioned rural skywatch tower by the United States Air Force's Civilian Ground Observation Corps under the Operation Skywatch program.

[2]: 5–6  In 1959, after the dissolution of the Civilian Ground Observation Corps, the watchtower was also abandoned.

[3] It was listed on the National Register of Historic Places in 2002.

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