NIS a.d. Novi Sad, also known as Naftna Industrija Srbije, is a prominent Serbian multinational oil and gas company based in Novi Sad. Founded in 1945, it operates primarily in Southeast Europe and is one of the largest and most profitable companies in Serbia, employing around 11,000 people. The company is majority-owned by Gazprom Neft and has a significant presence in the region with its main production facilities, including oil and gas deposits and two refineries in Serbia.

NIS's core activities include the exploration and production of oil and natural gas, refining operations, and the distribution of a wide range of petroleum products through over 400 petrol stations under the NIS Petrol and GAZPROM brands. The company also engages in various petrochemical and energy projects, including electricity trading in several neighboring countries. NIS is committed to quality and sustainability, holding multiple certifications in management systems, including ISO standards for quality, environmental management, and occupational health and safety.