The 34th Street–Herald Square station is an underground station complex on the BMT Broadway Line and the IND Sixth Avenue Line of the New York City Subway. It is located at Herald Square in Midtown Manhattan where 34th Street, Broadway and Sixth Avenue intersect, and is served by the D, F, N, and Q trains at all times; the R train at all times except late nights; the B, M, and W trains on weekdays; and the <F> train during rush hours in the peak direction.

The BMT Broadway Line is a rapid transit line of the B Division of the New York City Subway in Manhattan. As of November 2016, it is served by four services, all colored yellow: the N and ​Q trains on the express tracks and the R and ​W trains on the local tracks during weekdays. The line is often referred to as the "N and R", since those were the only services on the line from 1988 to 2001, when the Manhattan Bridge's southern tracks were closed for rebuilding. The Broadway Line was built to give the Brooklyn Rapid Transit Company access to Midtown Manhattan.