A seat is a place to sit. The term may encompass additional features, such as back, armrest, head restraint but also headquarters in a wider sense.

Types of seat

The following are examples of different kinds of seat:
The word seat comes from Middle English sete and from Old Norse sæti; akin to Old English gesete seat, sittan to sit. The first known use of the word seat is in the 13th century.


For someone seated, the 'buttock popliteal' length is the horizontal distance from the rearmost part of the buttocks to the back of the lower leg. This anthropometric measurement is used to determine seat depth. Mass-produced chairs typically use a depth of.