The Bx23 and Q50 bus routes constitute a public transit corridor in New York City, running from the Flushing neighborhood in Queens to the Pelham Bay and Co-op City neighborhoods in the Bronx. The Bx23 provides local service in Pelham Bay and Co-op City, while the Q50 provides limited-stop service between Co-op City and subway hubs in Pelham Bay and Flushing. Both routes are city-operated under the MTA Bus Company brand of MTA Regional Bus Operations, and are the only two local routes in the Bronx to operate under the MTA Bus brand, rather than under the MaBSOTA brand that all other Bronx bus routes operate under.

Pelham Bay is a middle class residential neighborhood in the borough of the Bronx, in New York City. It is named for Pelham Bay Park, New York City's largest park, which lies on the neighborhood's northeastern border; and for Pelham Bay, a body of water in that park. The neighborhood is bounded roughly by Pelham Parkway on the north, the New England Thruway (I-95) on the east, the Bruckner Expressway (I-95) on the south, and the Hutchinson River Parkway on the west.