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Diphenyl ether, also known as phenyl ether or phenoxybenzene, is an organic compound with the chemical formula (C6H5)2O. It is a colorless liquid with a distinct geranium-like odor. It is relatively stable and insoluble in water but soluble in many organic solvents like ethanol and ether.

Diphenyl ether is produced industrially through the Ullmann condensation reaction, where phenol reacts with bromobenzene or chlorobenzene in the presence of a copper catalyst and a base at high temperatures. Another method involves the dehydration of phenol at elevated temperatures.

This compound finds application as a heat transfer fluid due to its high boiling point and thermal stability. It is also used as a fragrance ingredient in perfumes and soaps, contributing a floral note. Additionally, diphenyl ether serves as a starting material or intermediate in the synthesis of other organic chemicals, including certain flame retardants and pesticides. Its low toxicity and good chemical resistance make it suitable for various industrial processes.