乙酸正丁酯，简称乙酸丁酯，结构式CH₃C(O)OC₄H₉。

无色透明有愉快果香气味的液体。较低级同系物难溶于水；与醇、醚、酮等有机溶剂混溶。易燃。急性毒性较小，但对眼鼻有较强的刺激性，而且在高浓度下会引起麻醉。

乙酸正丁酯是一种优良的有机溶剂，对乙基纤维素、醋酸丁酸纤维素、聚苯乙烯、甲基丙烯酸树脂、氯化橡胶以及多种天然树胶均有较好的溶解性能。

n-Butyl acetate, also known as butyl ethanoate, is an ester which is a colorless flammable liquid at room temperature. Butyl acetate is found in many types of fruit, where along with other chemicals it imparts characteristic flavors and has a sweet smell of banana or apple. It is used as a synthetic fruit flavoring in foods such as candy, ice cream, cheeses, and baked goods. Butyl acetate is often used as a high-boiling solvent of moderate polarity.