The 2004 Taylor Energy oil spill is an ongoing spill located in the Gulf of Mexico, around 11 miles (18 km) off the coast of the U.S. state of Louisiana. It is the result of the destruction of a Taylor Energy oil platform during Hurricane Ivan in 2004. It is the longest-running oil spill in U.S. history. It was first brought to public attention when contamination at the site was noticed in 2010 by those monitoring the nearby Deepwater Horizon oil spill. A report by the Associated Press in 2015 challenged the estimates of the extent of the leak originally given by the company and the U.S. Coast Guard (USCG), which were then revised to be around 1,000 times greater than initially reported.

An oil spill is the release of a liquid petroleum hydrocarbon into the environment, especially the marine ecosystem, due to human activity, and is a form of pollution. The term is usually given to marine oil spills, where oil is released into the ocean or coastal waters, but spills may also occur on land. Oil spills may be due to releases of crude oil from tankers, offshore platforms, drilling rigs and wells, as well as spills of refined petroleum products and their by-products, heavier fuels used by large ships such as bunker fuel, or the spill of any oily refuse or waste oil.