Car boot sales are a mainly British form of market in which private individuals come together to sell their unwanted items. In U.S. terms, a car boot sale would be considered somewhere between a garage sale and a swap-meet . Though garage sales are not unknown in the UK, car boot sales are much more popular.

Car boot sales are often held in the grounds of schools and other community buildings, or in grassy fields or carparks. Usually they take place on weekend mornings. Sellers pay a nominal fee for their pitch, and arrive with their goods in the boot (trunk) of their car. Usually the items are then unpacked onto folding tables, a blanket or tarpaulin, or simply the ground. Entry to the general public is usually free. Advertised opening times are often not strictly adhered to, and in many cases the nature of the venue itself makes it impossible to prevent keen bargain hunters from wandering in as soon as the first stallholders arrive.

It is not unknown for stolen goods to be sold at car boot sales.