The 9 Broadway–Seventh Avenue Local was a rapid transit service in the A Division of the New York City Subway. Its route emblem, or "bullet", was colored red, since it used the Interborough Rapid Transit Company (IRT)'s Broadway–Seventh Avenue Line for its entire route.

The IRT Broadway–Seventh Avenue Line is a New York City Subway line. It is one of several lines that serves the A Division, stretching from South Ferry in Lower Manhattan north to Van Cortlandt Park–242nd Street in Riverdale, Bronx. The Brooklyn Branch, known as the Wall and William Streets Branch during construction, from the main line at Chambers Street southeast through the Clark Street Tunnel to Borough Hall in Downtown Brooklyn, is also part of the Broadway–Seventh Avenue Line. The IRT Broadway–Seventh Avenue Line is the only line to have elevated stations in Manhattan, with two short stretches of elevated track at 125th Street and between Dyckman and 225th Streets.