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TAEE, or tert-Amyl ethyl ether (also known as tertiary amyl ethyl ether or 2-ethoxy-2-methylbutane), is an organic chemical compound classified as an ether, with the molecular formula C₇H₁₆O.

TAEE is produced by the acid-catalyzed etherification reaction of ethanol with 2-methyl-2-butene (an isoamylene). It is a colorless liquid primarily used as a fuel additive. As a gasoline oxygenate, it increases the octane rating, improves combustion efficiency, and reduces harmful vehicle emissions. Like other fuel ethers, TAEE helps make petrol cleaner-burning and enhances engine performance.

TAEE also serves as a solvent in organic chemistry. Structurally, it is similar to methyl tert-butyl ether (MTBE), but with an ethyl group replacing the methyl group. Its notable properties include a relatively high boiling point (around 102 °C), making it less volatile than MTBE.

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