Zhang Yixing (张艺兴; born 7 October 1991), known professionally as Lay (레이) and known internationally as Lay Zhang , is a Chinese rapper, singer-songwriter, dancer, actor, producer under Zhang Yixing Studio. He is a member of the South Korean boy group EXO and its sub-group EXO-M.

In 2015, Zhang founded a personal agency for his solo activities and music releases and released an autobiography titled Standing Firm at 24. In 2016, Zhang released his first mini album, Lose Control. The EP peaked at number one on the Gaon Album Chart and number four on Billboard's US World Albums chart. Since his debut as a solo artist, Zhang has produced and released over 100 songs including 4 studio albums and 5 mini albums. In 2020, Zhang founded the Chromosome Entertainment Group and serves as CEO.

He has also ventured into acting and starred in films and television shows such as Ex-Files 2 (2015), The Mystic Nine (2016), Kung Fu Yoga (2017), The Island (2018), The Golden Eyes (2019), Empress of the Ming (2019), Crime Crackdown (2021) and No More Bets (2023).