• Attock Oil Refinery
• Pak-Arab Oil Refinery
• Pakistan Refinery Limited
• National Refinery Limited

Cnergyico Pk Limited, formerly known as Byco Petroleum Pakistan Limited/Bosicor Pakistan Limited, is the largest oil refinery in Pakistan. It has an installed capacity of 156,000 barrels per day (bpd) of crude oil for the production of petrol, diesel, furnace oil and other petroleum products. It is located in Karachi, Sindh, Pakistan.

The second largest oil refinery in Pakistan is Pak Arab Refinery (Parco). It has an installed capacity of 120,000 bpd of crude oil for the production of petrol, diesel, furnace oil and other petroleum products.