Eutectic high-entropy alloys have received extensive research in recent years due to their good castability and exceptional combination of strength-ductility balance. However, compositional designation of eutectic high-entropy alloys is still a challenge. Based on this challenge, a variety of methods for compositional designation in eutectic high-entropy alloys have been developed. Each method has its own characteristics and limitations. The methods for compositional designation in eutectic high-entropy alloys are reviewed in this paper.