English units refers to the historical units of measurement in medieval England, which evolved as a combination of the Anglo-Saxon and Roman systems of units. They were redefined in England in 1824 by a Weights and Measures Act, which retained many but not all of the unit names with slightly different values, and again in the 1970s by the SI subset of the Metric system. In modern UK usage, the term is considered ambiguous, as it could refer either to the imperial system used in the UK prior to metrication, or to the US customary system of unit. The usual term used in the UK for the system immediately prior to metrication is imperial units. Within the United States, the same term is commonly used to refer to the United States Customary System, which retains some unit names but with different values, as well as to the imperial units. Various standards under the name English units have applied at different times, in different places and for different things.

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