An oil refinery or petroleum refinery is an industrial process plant where petroleum is transformed and refined into products such as gasoline (petrol), diesel fuel, asphalt base, fuel oils, heating oil, kerosene, liquefied petroleum gas and petroleum naphtha. Petrochemical feedstock like ethylene and propylene can also be produced directly by cracking crude oil without the need of using refined products of crude oil such as naphtha. The crude oil feedstock has typically been processed by an oil production plant. There is usually an oil depot at or near an oil refinery for the storage of incoming crude oil feedstock as well as bulk liquid products. In 2020, the total capacity of global refineries for crude oil was about 101.2 million barrels per day.

तेल शुद्धीकरण प्रकल्प किंवा तेल रिफायनरी किंवा ऑइल रिफायनरी किंवा पेट्रोलियम रिफायनरी हा एक औद्योगिक प्रक्रिया कारखाना आहे जिथे खनिज तेलाचे उपयुक्त उत्पादनांमध्ये रूपांतर केले जाते जसे की पेट्रोल (गॅसोलीन), डिझेल इंधन, डांबर बेस, इंधन तेले, रॉकेल, द्रवीभूत पेट्रोलियम गॅस आणि नाफ्था. पेट्रोकेमिकल्स फीडस्टॉक जसे की इथिलीन आणि प्रोपीलीन देखील कच्च्या तेलातून तयार केले जाते.