The IND Sixth Avenue Line is a rapid transit line of the B Division of the New York City Subway in the United States. It runs mainly under Sixth Avenue in Manhattan, and continues south to Brooklyn. The B, D, F, and M trains, which use the Sixth Avenue Line through Midtown Manhattan, are colored orange. The B and D trains use the express tracks, while the F, <F> and M trains use the local tracks.

The B Sixth Avenue Express is a rapid transit service in the B Division of the New York City Subway. Its route emblem, or "bullet", is colored orange, since it uses the IND Sixth Avenue Line in Manhattan.