Marmarabirlik is a Turkish olive production company. It was established on 28 June 1954 as a Union of Agricultural Sales Cooperative (UASC), cultivating, harvesting and marketing of olives with mutual assistance and cooperation of the region's olive farmers. The founder members of Marmarabirlik were respectively Gemlik, Mudanya and Erdek Olive Agriculture Sales Cooperatives. Subsequently, Orhangazi, İznik, , Mürefte, and Marmara Island Olive Agriculture Sales Cooperatives joined the union. Currently, the operating area has extended from to the South Coast of Marmara Sea and Mürefte; a total of eight member cooperatives have evolved into a union. The general manager of Marmara Birlik is İsmail Acar and the chairman of the board of directors is Hidamet Asa.