三氯乙醛，结构式CCl₃CHO。

无色易挥发有刺激性气味油状液体。溶于水、乙醇、乙醚、氯仿，遇水反应生成水合三氯乙醛。有腐蚀性、麻醉性，与皮肤接触时会引起灼伤，眼部接触可致散瞳，吸入过量可能造成窒息。

Chloral, also known as trichloroacetaldehyde or trichloroethanal, is the organic compound with the formula Cl₃CCHO. This aldehyde is a colourless oily liquid that is soluble in a wide range of solvents. It reacts with water to form chloral hydrate, a once widely used sedative and hypnotic substance.