Aloys Grillmeier SJ (1 January 1910 – 13 September 1998) was a German Jesuit priest, theologian and cardinal-deacon of the Catholic Church.

Pope John Paul II created him cardinal-deacon of San Nicola in Carcere on 26 November 1994.

Two days after the graduation ceremony Grillmeier was conscripted into the German army and trained as a medical orderly in Ulm.

In the 1970s he became an adviser to the Pro Oriente Institute in Vienna, which promoted contact with other Christian Churches, especially in the East, and he took part in several unofficial theological dialogues with the Oriental Orthodox Churches and was a member of the official dialogue commission Coptic Orthodox – Roman Catholic.

Grillmeier's written output – 12 major books and several hundred academic articles – is a part of his legacy.