The Bergen County Cooperative Library System (BCCLS, pronounced "buckles") is a consortium of public libraries in the four northeastern New Jersey Gateway Region counties of Bergen, Hudson, Passaic, and Essex.

Founded on October 1, 1979, the organization allows for reciprocal borrowing among its members so that books, audiobooks, CDs, DVDs and other media are shared among the libraries cooperatively.

[3] Those with a valid library card from participating towns are permitted to reserve materials online and have them transferred to their local library, where materials can be retrieved.

[4] As of 2019, there are 77 public libraries with a total of 81 branches participating in the consortium.

The BCCLS had also participated in the Open Borrowing (www.openborrowing.org) program, with participating libraries in Middlesex, Morris, Passaic, Sussex and Warren counties; this participation ended on January 1, 2015.