The J Nassau Street Local/Express and Z Nassau Street Express (displayed as Jamaica Local/Express on the R160 cars) are two rapid transit services in the New York City Subway's B Division. Their route emblems, or "bullets", are colored brown since they use the BMT Nassau Street Line in Lower Manhattan.
The J operates at all times while the Z, operating internally as its rush hour variant, operates with only six trips in the peak direction on weekdays; both services run through the entirety of the BMT Archer Avenue and Jamaica lines, the Williamsburg Bridge, and the Nassau Street Line between Jamaica Center–Parsons/Archer in Jamaica, Queens and Broad Street in Lower Manhattan. When the Z operates, the two services form a skip-stop pair between Sutphin Boulevard–JFK and Myrtle Avenue–Broadway. In addition on weekdays during rush hours and middays in the peak direction, they run express between that station and Essex Street, bypassing four stations. At all other times, only the J operates, serving every station on its entire route.