Ion exchange is the reversible substitution of one type of ion found in an insoluble solid with another type of ion with a similar charge found in a surrounding fluid. The method is used extensively for the purification by separation of numerous industrially and medicinally significant compounds in addition to its application in the purification of drinking water. More than two materials with differing physicochemical properties combine to form a material called a composite. The objective of this material is to improve the properties of its constituent parts. When it comes to material performance, composites are far superior to mono-material alternatives, especially when it comes to the independent use of the component parts. Ion-exchange polymers can be sorbent on inert substrates with a large surface area to generate composite ion exchangers. Electrochemical measurements of the flux of ions and molecules through these composites often show an increase with an enhanced ratio of the substrate's surface area to the ion exchanger's volume. This implies that the transport properties of the composites are influenced by fields and gradients formed at the interface between the ion exchanger and substrate. In this chapter, the authors focus on describing various composite ion-exchange sorbents that are developed and addressing their various properties and applications.