The pint (, listen ; symbol pt, sometimes abbreviated as p) is a unit of volume or capacity in both the imperial and United States customary measurement systems. In both of those systems it is traditionally one eighth of a gallon. The British imperial pint is about 20% larger than the American pint because the two systems are defined differently. Almost all other countries have standardized on the metric system, so although some of them still also have traditional units called pints (such as for beverages), the volume varies by regional custom.

The imperial pint (≈ 568 mL) is used in the United Kingdom and Ireland and to a limited extent in Commonwealth nations. In the United States, two kinds of pint are used: a liquid pint (≈ 473 mL) and a less common dry pint (≈ 551 mL). Other former British colonies, such as Canada, Australia, South Africa and New Zealand, converted to the metric system in the 1960s and 1970s; so while the term pint may still be in common use in these countries, it may no longer refer to the British imperial pint once used throughout the British Empire.

Since the majority of countries in the world no longer use American or British imperial units, and most are non-English speaking, a "pint of beer" served in a tavern outside the United Kingdom and the United States may be measured by other standards. In Commonwealth countries it may be a British imperial pint of 568 mL, in countries serving large numbers of American tourists it might be a US liquid pint of 473 mL, in many metric countries it is a half-litre of 500 mL, in some places it is another measure reflecting national and local laws and customs.