The R6 was a New York City Subway car model built from 1935 to 1936 for the city-operated Independent Subway System by three manufacturers under separate orders, the American Car and Foundry Company, Pullman Standard, and Pressed Steel Car Company.

A total of 500 cars were built, numbered 900–1399, and arranged as single units.

They served exclusively on all IND lines for most of their service lives, but were also used on the BMT Division's Eastern Division's J and L lines during their final years of service.

The R6s were ordered to equip extensions of the IND in Brooklyn and Queens.

These continued to run on the IND until 1976 and on the BMT Eastern Division until 1977.