Hagemans Crossing is an unincorporated place in Union Township, Warren County, Ohio, United States. Located in the western part of the township, it is located on the old Cincinnati and Xenia Pike, now U.S. Route 42, about halfway between Lebanon and Mason, Ohio. It was at the crossing of the Middletown and Cincinnati Railroad and the Cincinnati, Lebanon and Northern Railway and was about two miles northwest of the M&C's eastern terminus at Middletown Junction. It was named for the Rev. R.S. Hageman, who lived there. In the 19th century a post office was located there, but today there are only three buildings.
It is variously known as Camp Hageman, Camp Hagerman, Hageman, and Hagerman's Crossing.