Kossar's Bialys (Kossar's Bialystoker Kuchen Bakery) located at 367 Grand Street (and Essex Street), on the Lower East Side in Manhattan, New York City, is the oldest bialy bakery in the United States.

[3] Kossar's Bialys, originally known as Mirsky and Kossar's[4] when Isadore Mirsky and Morris Kossar founded it in 1936, is one of the few remnants of what was once its own industry in New York City with its own union association and an owners' alliance known the Bialy Bakers Association, Inc.[5] Originally located on Clinton Street in Manhattan's Lower East Side, Kossar's Bialys moved to its current location at Grand and Essex Streets in the early 1960s after a union dispute and subsequent fire destroyed the building.

[7][8] In 2013, Evan Giniger and David Zablocki purchased the bakery from the Engelmayers and Cohens.

After the sale, the new owners made a number of upgrades and changes to the store, including expanding the menu and making the decision to no longer operate as a kosher establishment.

Kossar's has a history of employing many female cashiers from the Philippines and employees from other countries as well.