朗当（法语：Randan）是法国多姆山省的一个市镇，属于里永区（Riom）朗当县（Randan）。该市镇总面积15.65平方公里，2009年时的人口为1536人。

朗当人口变化图示

A randan is a boat rowed by three persons, stern and bow using a single oar each and the central person a pair of sculls. The word is of unknown origin, and can hardly be connected with a slang term for a row or spree, which is found as early as the beginning of the 18th century and is generally taken as a variation of random, haphazard.