A clothes line or washing line is any type of rope, cord, or twine that has been stretched between two points (e.g. two sticks), outside or indoors, above the level of the ground. Clothing that has recently been washed is hung along the line to dry, using clothes pegs or clothespins. Washing lines are attached either from a post or a wall, and are frequently located in back gardens, or on balconies. Longer washing lines often have props holding up sections in the middle due to the weight of the usually wet clothing.

Clothes-Line was an early BBC television programme broadcast live in six parts between 30 September and 3 December 1937. It is notable for being the first television programme dedicated to the history of fashion. It was produced by Mary Adams, and co-presented by the fashion historian James Laver and Pearl "Polly" Binder.