Aloysius John Wycisło (June 17, 1908 – October 11, 2005) was an American prelate of the Roman Catholic Church who served as the eighth bishop of the Diocese of Green Bay in Wisconsin from 1968 to 1983.

In September 1962, Cardinal Meyer asked Wycisło to direct the Archdiocese of Chicago's observance of Poland's millennium of Christianity.

Wycisło handled all the preparations, including arrangements for the visit of the primate of Poland, Cardinal Stefan Wyszyński.

In addition to attending all the sessions, Wycisło served as a member of the American Bishops' Commissions on the Lay Apostolate and on the Missions and the Oriental Church.

He met and became friends with Karol Wojtyła, then-Archbishop of Krakow, Poland, and who became Pope John Paul II.