OK Kosher Certification

Hechsher of Organized Kashrut Laboratories
Certifying agency	Organized Kashrut Laboratories
Founded	1935
Headquarters	391 Troy Ave, Brooklyn, NY 11213 U.S.
Key People	Rabbi Shlomo Weinfeld (Chairman, Executive Rabbinical Council) Rabbi Levi Marmulszteyn (Rabbinic Manager)
Website	ok.org

OK Kosher Certification is a major kosher certification agency based out of Brooklyn, NY. It is one of the "Big Five," the five largest kosher certifying agencies in the United States. OK also has a large kosher presence in Asia.