朱利叶斯·温菲尔德·欧文二世（英语：Julius Winfield Erving II，1950年2月22日－），绰号J博士（Dr. J），前美国职业篮球运动员，担任小前锋。身高六呎七寸，体重二百一十磅，于1971年加入美国篮球协会 (ABA)，1976年起加入NBA，先后为弗吉尼亚绅士队 (ABA)、纽约网队 (ABA) 和费城七六人队效力十六个赛季。

欧文的绰号「J博士」非常知名，据说是源于他在高中时常以「教授」敬称他的一位朋友，而那位朋友则以「博士」来恭维欧文。

Julius Winfield Erving II (born February 22, 1950), commonly known by the nickname Dr. J, is an American retired basketball player who helped popularize a modern style of play that emphasizes leaping and playing above the rim. Erving helped legitimize the American Basketball Association (ABA) and was the best-known player in that league when it merged with the National Basketball Association (NBA) after the 1975–76 season.