碘乙烷是一种无色、易燃的有机化合物。其化学式为C₂H₅I，可由碘、磷及乙醇加热制得。与空气接触，尤其是在光照条件下，碘乙烷会分解，产生的碘溶于碘乙烷而使碘乙烷略显黄色。

Ethyl iodide (also iodoethane) is a colorless, flammable chemical compound. It has the chemical formula C₂H₅I and is prepared by heating ethanol with iodine and phosphorus. On contact with air, especially on the effect of light, it decomposes and turns yellow or reddish from dissolved iodine. It may also be prepared by reaction between hydroiodic acid and ethanol distilling off the ethyl iodide. Ethyl iodide should be stored in copper powder to avoid fast decomposition, though even with this method samples don't last more than 1 year.