What is the name of the world's largest oil refinery by capacity?

The world’s largest oil refinery by capacity is the Jamnagar Refinery in Gujarat, India.

Owned and operated by Reliance Industries, the Jamnagar site is actually a massive refining complex containing two adjacent refineries. Its combined capacity is about 1.24 million barrels of crude oil per day, making it the largest refining location in the world. The complex is in Motikhavdi, in Jamnagar district, beside major port and industrial facilities.

The first refinery began operating in 1999 with an initial capacity of roughly 668,000 barrels per day. Reliance later added a second refinery, commissioned in 2008, greatly expanding the site and helping India become a major exporter of refined petroleum products.

“Largest refinery” can be confusing because rankings may compare one processing unit, one refinery, or an entire complex. Jamnagar’s record generally refers to the combined complex. It is designed to process a wide range of crude oils, including heavier and higher-sulfur feedstocks, and to produce fuels and petrochemical feedstocks.