The top five largest oil refining complexes globally are recognized for their massive crude oil processing capacities and complex conversion units. The list includes the Jamnagar Refinery complex in India, the Paraguana Refinery Complex in Venezuela, the Ulsan Refinery in South Korea, the Yeosu Refinery in South Korea, and the Al-Zour Refinery in Kuwait. These industrial facilities process hundreds of thousands to over a million barrels of crude oil per day, producing refined fuels, petrochemicals, and petroleum products to supply global energy markets.