What is the biggest oil tanker in the world?

The biggest oil tanker in the world is the Knock Nevis, formerly known as the Seawise Giant. This ultra-large crude carrier (ULCC) measures approximately 1,504 feet (458.45 meters) in length and has a deadweight tonnage of around 564,763 tons. Launched in 1979, it was used primarily for transporting crude oil until it was retired from service in 2009 and eventually scrapped in 2020. The Knock Nevis remains a significant engineering marvel in maritime history.