The Putnam Avenue Line is a public transit line in Brooklyn, New York City, running mostly along Fulton Street, Putnam Avenue, and Halsey Street between downtown Brooklyn and Ridgewood, Queens.

Originally a streetcar line, it is now the B26 Halsey/Fulton Streets bus route, operated by the New York City Transit Authority.

[5] By 1897, cars could also use a short spur along Howard Avenue from Halsey Street north to Broadway.

Putnam Avenue horse cars were replaced with electric trolleys on July 17, 1893.

The B26 would also replace overnight service on the B25 west of Franklin Avenue, making all local stops.