The following highways are numbered 373:
International European route E373
Brazil BR-373
Canada Manitoba Provincial Road 373 Quebec Route 373 Saskatchewan Highway 373
Japan Japan National Route 373
United States Arizona State Route 373 Florida State Road 373 Georgia State Route 373 (former) Maryland Route 373 Nevada State Route 373 New York State Route 373 Ohio State Route 373 Puerto Rico Highway 373 Farm to Market Road 373 Virginia State Route 373 Wyoming Highway 373