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Ethylene glycol is an organic compound with the formula HOCH2CH2OH. It is a colorless, odorless, viscous liquid that is miscible with water. Ethylene glycol is primarily used as an antifreeze in automotive cooling systems, as it lowers the freezing point of water. It is also used in the production of polyester fibers and resins, such as polyethylene terephthalate (PET). Other applications include use as a solvent, in deicing fluids, and as a component in hydraulic fluids.

The production of ethylene glycol is typically achieved through the hydration of ethylene oxide. Ethylene oxide itself is derived from the oxidation of ethylene. This industrial process is carried out on a large scale worldwide due to the compound's widespread use.

While useful, ethylene glycol is toxic if ingested. Its sweet taste can make it attractive to children and pets, leading to accidental poisoning. Symptoms of ethylene glycol poisoning can include central nervous system depression, metabolic acidosis, and kidney damage. Due to its toxicity, proper handling, storage, and disposal are crucial. Antifreeze products containing ethylene glycol are often dyed bright colors to help with visibility and to warn of their hazardous nature.