Lansing Beach (June 18, 1860 – April 2, 1945) was a U.S. Army officer who served for a time as Chief of Engineers.

Among his classmates there at the academy were several men who would, like Beach himself, eventually attain the rank of brigadier general or higher during their military careers, such as Edward Burr, Adelbert Cronkhite, John T. Thompson, Charles Treat, Edward A. Millar, Richard W. Young, Benjamin Alvord Jr., George W. McIver, Henry T. Allen, William H. Sage, and Thomas B. Dugan, and William H. Allaire.

Beach developed plans for the reconstruction of the Muskingum River locks and dams soon after Ohio ceded the state-built improvements to the federal government in 1887.

In the latter capacity and as Chief of Engineers, he oversaw construction of the huge Wilson Locks and Dam on the Tennessee River.

After retirement, General Beach served as consulting engineer for various business interests in the United States and Mexico.