The DeKalb Avenue Line is a public transit line in Brooklyn and Queens, New York City, United States, running mostly along DeKalb Avenue, as well as eastbound on Lafayette Avenue (as part of a one-way pair), between downtown Brooklyn and Ridgewood, Queens. Originally a streetcar line, it is now the B38 DeKalb/Lafayette Avenues bus route, operated by the New York City Transit Authority.
At its east end, after crossing into Queens, the line turns southeast on Seneca Avenue and ends just short of Myrtle Avenue. A branch runs northeast on Stanhope Street to Linden Hill Cemetery.
The B38 bus route begins at a loop around Borough Hall in Downtown Brooklyn. It heads east on Fulton Street, splitting onto DeKalb Avenue (westbound) and Lafayette Avenue (eastbound). After crossing Broadway, eastbound buses return to DeKalb Avenue via Bushwick Avenue. The route crosses into Ridgewood, Queens and turns southeast on Seneca Avenue; every other bus turns northeast on Stanhope Street to a loop around Linden Hill Cemetery, while the rest continue along Seneca Avenue to just shy of Myrtle Avenue. Along the way, transfer can be made to the subway at Court Street – Borough Hall (2 3 4 5 N R W), Jay Street – MetroTech (A C F), DeKalb Avenue (BMT Fourth Avenue and Brighton Lines) (B D N Q R W), Classon Avenue (G), Kosciuszko Street (J), DeKalb Avenue (BMT Canarsie Line) (L), and Seneca Avenue (M).