The British decimal twenty-five pence (25p) coin was a commemorative denomination of sterling coinage issued in four designs between 1972 and 1981. These coins were a post-decimalisation continuation of the traditional crown, with the same value of a quarter of a pound. Uniquely in British decimal coinage, the coins do not have their value stated on them. This is because previous crowns rarely did so. The British regular issue coin closest to the coin's nominal value is the twenty pence coin.

The standard circulating coinage of the United Kingdom, British Crown Dependencies and British Overseas Territories is denominated in pennies and pounds sterling, and ranges in value from one penny sterling to two pounds. Since decimalisation, on 15 February 1971, the pound has been divided into 100 (new) pence. Before decimalisation, twelve pence made a shilling, and twenty shillings made a pound.