Daniel Leo Ryan (September 28, 1930 – December 31, 2015) was an American prelate of the Roman Catholic Church. He served as bishop of the Diocese of Springfield in Illinois from 1984 to 1999. He previously served as an auxiliary bishop of the Diocese of Joliet in Illinois from 1981 to 1984. Amid accusations of sexual misconduct and protecting sexually abusive priests, Ryan resigned as bishop of Springfield in 1999.