Triethyl orthoacetate is the organic compound with the formula CH<sub>3</sub>C(OC<sub>2</sub>H<sub>5</sub>)<sub>3</sub>. It is the ethyl orthoester of acetic acid. It is a colorless oily liquid.
Triethyl orthoacetate is used in organic synthesis for acetylation.
It is also used in the Johnson-Claisen rearrangement.