Johnsville may refer to any of the following locations in the United States:
Johnsville, Arkansas Johnsville, California Johnsville, Kentucky Johnsville, Maryland Johnsville Naval Air Development Center, officially NAWC, Aircraft Division, Warminster, a former research and development facility for the United States Navy Johnsville, a former place-name in New York; now East Fishkill Johnsville, Ohio Johnsville, Pennsylvania, now Warminster Township, Pennsylvania