英制单位是源自英国的度量衡单位制。

由于十进制的公制单位使用方便，多为各国采行，英国自1965年起立例转换成国际单位制，并于1995年完成了单位制的转换（但陆路交通仍以英里作为单位）。但国际上许多个别领域，仍沿用英制；例如电视机、电脑显示器、手机屏幕大小以英吋表示；航空管制上，如飞行高度、跑道长度等，多以英呎为单位。

其量度单位为了与公制或中国传统单位区别，多在单位前加一「英」字，或冠以口字旁称之，如：英里（英哩）、英尺（英呎）、英寸（英吋），或简称哩、呎、吋。另见计量用汉字。

The system of imperial units or the imperial system (also known as British Imperial) is the system of units first defined in the British Weights and Measures Act of 1824, which was later refined and reduced. The system came into official use across the British Empire. By the late 20th century, most nations of the former empire had officially adopted the metric system as their main system of measurement; however some imperial units are still used in the United Kingdom, Canada and other countries formerly part of the British Empire. The imperial system developed from what were first known as English units, as did the separate system of United States customary units.