The Broadway Line is a surface transit line in Manhattan, New York City, running mainly along 42nd Street and Broadway from Murray Hill to Harlem.

Formerly a streetcar line operated by the Third Avenue Railway, it is now the M104 bus route operated by the New York City Transit Authority, a subsidiary of the Metropolitan Transportation Authority.

The M104 route begins at 41st Street and 8th Avenue, by Times Square.

[5] Effective February 17, 1908, as part of the splitting of the Third Avenue Railroad from the bankrupt Metropolitan Street Railway, the Third Avenue's Broadway cars were sent along their old route, heading east on 42nd Street at Times Square and ending at the East 34th Street Ferry via First Avenue.

In June 2010, due to budget cuts, the M104 bus route was truncated to Times Square from the Headquarters of the United Nations, eliminating service along 42nd Street.