M21 (New York City bus)

m21
Houston Street Crosstown
A 2021 Nova Bus LFS HEV (9689) on the M21 in SoHo, Manhattan
Overview
System	MTA Regional Bus Operations
Operator	New York City Transit Authority
Garage	Michael J. Quill Depot
Vehicle	New Flyer Xcelsior XD40 New Flyer Xcelsior XE40 Nova Bus LFS HEV
Route
Locale	Manhattan, New York, U.S.
Communities served	West Village, SoHo, Lower East Side
Start	West Village – Spring St and Hudson St West Village - 6th Avenue and Spring Street (PM rush hour)
Via	Houston St
End	Lower East Side – Grand Street and FDR Drive
Length	2.5 miles (4.0 km)
Service
Weekend frequency	Every 30 minutes
Operates	6:30 AM-11:50 PM
Annual patronage	300,809 (2023)[1]
Transfers	Yes
Timetable	M21
Route map ← M20  {{{system_nav}}}  M22 →

The M21 bus route constitutes a public transit line in Manhattan, New York City. The M21 operates between the West Village and the Lower East Side, serving as a Houston Street crosstown. The M9 and M21 are operated by the New York City Transit Authority, and based out of the Michael J. Quill Depot.