Fulling, also known as tucking or walking (Scots: waukin, hence often spelled waulking in Scottish English), is a step in woollen clothmaking which involves the cleansing of woven cloth (particularly wool) to eliminate (lanoline) oils, dirt, and other impurities, and to make it shrink by friction and pressure. The work delivers a smooth, tightly finished fabric that is isolating and water repellent. Well known example are duffel cloth, first produced in Flanders in the 14th century and loden, produced in Austria from the 16th century on.

Waulking could be done with the hands and feet. In Medieval Europe, it was done in water-powered fulling mills. After the industrial revolution, coal and electric power were used.

Felting refers more generally to the interlocking of loose wool fibers; they need not be spun and woven first.