英寻（㖊）是一种英美长度单位，1英寻为6英尺，约合1.8288米；不属于国际单位制。英寻（英语：Fathom）来自古英语“Fæthm”，表示“伸展开的双臂”，因而一英寻也就是两臂之长。如今这个单位的使用被严格限制在海洋测量中，特别是使用淮绳测量水体深度的情况下。从前英语国家的海图普遍使用“英寻”作为深度的单位，然而现在这种情况也在逐渐改变，甚至在美国也开始使用公制作为单位。

A fathom = 6 feet or 1.8288 metres, is a unit of length in the old imperial and the U.S. customary systems, used especially for measuring the depth of water.

There are two yards (6 feet) in an imperial fathom. Originally based on the distance between a man's outstretched arms, the size of a fathom has varied slightly depending on whether it was defined as a thousandth of an (Admiralty) nautical mile or as a multiple of the imperial yard. Formerly, the term was used for any of several units of length varying around 5–5 ⁄₂ feet (1.5–1.7 m).