List of bus routes in Nassau County, New York

These tables give details for the routes that service Nassau County primarily.

For details on routes that run into Nassau County but do not service it primarily, see: Some of routes listed below are the direct descendants of streetcar lines (see List of streetcar lines on Long Island and in Queens), and most were privately operated prior to 1973.

NICE routes are designated on the buses, bus stop signs, and timetables with a lowercase "n".

Connections to New York City Subway stations at the bus routes' terminals are also listed where applicable.

In addition to being served by the n21 and n27 bus routes, the City of Glen Cove also operates two weekday services.