High Street, or the High Street (often abbreviated to High St), is a metonym for the generic name (and frequently the official name) of the primary business street of towns or cities in the United Kingdom. It is usually a focal point for shops and retailers in the city centre, and is most often used in reference to retailing.

The equivalent in the United States, Canada and the Irish Republic is Main Street, a term also used in smaller towns and villages in Scotland. In Jamaica, North East England, and some sections of Canada, the usual term is Front Street. In Cornwall and some towns in Devon, the equivalent is Fore Street.

High Street is the most common street name in the UK. According to a survey by the Halifax, there are 5,410 High Streets compared to 3,811 Station Roads and 2,702 Main Streets.

Interestingly, the term is far less common in Ireland. Neither of Ireland's two main shopping streets (Grafton Street and O'Connell Street) carry this name. An existing High Street in Dublin is relatively very small with few shops. For example, the OSI (Ordnance Survey Ireland) North Leinster Town Maps book lists 16 Main Streets and only 2 High Streets in its index of street names (of 30 towns). Similarly, the OSI Dublin Street Guide (4th series) covering all of Dublin City and County Dublin lists 20 Main Streets, but only 2 High Streets.