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).

Trương Nghệ Hưng, còn được biết đến với nghệ danh Lay hoặc Lay Zhang, là một nam ca sĩ, nhạc sĩ, nhà sản xuất âm nhạc, vũ công và diễn viên người Trung Quốc. Anh ra mắt với tư cách là thành viên của nhóm nhạc nam nổi tiếng Hàn-Trung EXO và nhóm nhỏ EXO-M do SM Entertainment thành lập và quản lý vào năm 2012.

张艺兴（LAY），1991年10月7日出生于湖南省长沙市，内地流行男歌手、影视演员，男子演唱组合EXO/EXO-M中国籍成员。

2005年， 张艺兴参加湖南经视《明星学院》比赛并获得总决赛季军。2008年，通过S.M. Casting System在中国的选拔成为韩国SM公司旗下练习生 。2012年4月，以EXO团体和其子队EXO-M成员身份正式出道。2015年4月8日，张艺兴在中国成立个人工作室，5月，因加盟励志体验真人秀节目《极限挑战》而受到广泛关注。

2016年6月，凭借爱情喜剧片《前任2：备胎反击战》获得第四届中英电影节最佳男配角奖；同年，他还发行个人首张创作专辑《LOSE CONTROL》并凭借其获得音悦V榜年度盛典年度专辑、内地最佳男歌手两项奖项。2017年10月，发行第二张个人专辑《SHEEP》 ；同年，凭借战争片《建军大业》提名第9届澳门国际电影节最佳男配角奖。2018年1月，参加爱奇艺综艺节目《偶像练习生》。2018年9月2日，《中国影视明星社会责任研究报告（2017-2018）》发布，张艺兴位居第四名。