汤匙（tablespoon，又译餐桌匙）是一种进食用的匙，其最常见的用途为喝汤，因而得名。

汤匙有烹调上也是一种容量量度单位。不同国家对汤匙的标准并不一样，但通常都约为15毫升。在美国，传统上1美制汤匙等如0.5美制液体盎司（14.8毫升），或者3美制茶匙。而美国联邦法例则规定1美制汤匙等如15毫升。

另一方面，加拿大、新西兰及英国将1汤匙订为等如20毫升。但传统上的英制汤匙，1汤匙可等如0.5至0.625英制液体盎司（14.2至17.8毫升）不等。

A tablespoon is a large spoon used for eating or serving. In most English-speaking regions, the term now refers to a large spoon used for serving, however, in some regions, including parts of Canada, it is the largest type of spoon used for eating. By extension, the term is used as a measure of volume in cooking. In this capacity, it is most commonly abbreviated tbsp or T, and occasionally referred to as a tablespoonful to distinguish it from the utensil. The unit of measurement varies by region: a United States tablespoon is approximately 14.7 ml, a United Kingdom tablespoon is exactly 15 ml, and an Australian tablespoon is 20 ml. The capacity of the utensil (as opposed to the measurement) is not defined by law or custom and bears no particular relation to the measurement.