National Lead of Ohio. See Fernald.
Nixon Aquatic Center, Oxford. See Recreational Sports Center, Miami University, for Corwin M. Nixon Aquatic Center.
Norfolk Southern Railroad. See Eaton & Hamilton Railroad Co ; Cincinnati, Dayton & Eastern; and Cincinnati, Hamilton & Dayton Railroad.
Norfolk & Western Railway. See Eaton & Hamilton Railroad Co
North Hall or Northeast Building. See Elliott Hall and Stoddard Hall