Cortelyou Library is a public library in Flatbush, Brooklyn, located on Cortelyou Road, owned and operated by the Brooklyn Public Library system.

[1] Flatbush residents began advocating and planning for the Cortelyou Branch starting in 1969.

[2][3] The library was one of the first in NYC to utilize a "merchandising format" of displaying books.

[4] The library was remodeled in 2021, led by community organization Friends of Cortelyou Library.

The branch re-opened in late 2021 after the six month remodel.