Ikat (in Indonesian languages means "bind") is a dyeing technique originating from Indonesia used to pattern textiles that employs resist dyeing on the yarns prior to dyeing and weaving the fabric.

In ikat, the resist is formed by binding individual yarns or bundles of yarns with a tight wrapping applied in the desired pattern. The yarns are then dyed. The bindings may then be altered to create a new pattern and the yarns dyed again with another colour. This process may be repeated multiple times to produce elaborate, multicolored patterns. When the dyeing is finished all the bindings are removed and the yarns are woven into cloth. In other resist-dyeing techniques such as tie-dye and batik the resist is applied to the woven cloth, whereas in ikat the resist is applied to the yarns before they are woven into cloth. Because the surface design is created in the yarns rather than on the finished cloth, in ikat both fabric faces are patterned.

A characteristic of ikat textiles is an apparent "blurriness" to the design. The blurriness is a result of the extreme difficulty the weaver has lining up the dyed yarns so that the pattern comes out perfectly in the finished cloth. The blurriness can be reduced by using finer yarns or by the skill of the craftsperson. Ikats with little blurriness, multiple colours and complicated patterns are more difficult to create and therefore often more expensive. However, the blurriness that is so characteristic of ikat is often prized by textile collectors.

Ikat is produced in many traditional textile centres around the world, including India to Central Asia, Southeast Asia, Japan (where it is called kasuri), Africa, and Latin America. Double ikats—in which both the warp and weft yarns are tied and dyed before being woven into a single textile—are relatively rare because of the intensive skilled labour required to produce them, especially in lining up the weft patterns.