N Line

N Line may refer to:


 * N Line (RTD), a commuter rail line in Denver
 * N Line, a commuter rail line serving Seattle, Washington, United States
 * N (New York City Subway service), a subway line in New York City
 * Transilien Line N, a suburban rail sector in Île de France
 * N Judah, a light rail line in San Francisco
 * N (Los Angeles Railway), a former streetcar service in Los Angeles