Lorenz Jaeger (23 September 1892 – 1 April 1975) was a German cardinal of the Roman Catholic Church, who served as Archbishop of Paderborn from 1941 to 1973, and was elevated to the cardinalate in 1965.

He received his episcopal consecration on the following 19 October from Archbishop Cesare Orsenigo, with Bishops Joseph Machens and Augustus Baumann serving as co-consecrators.

From 1962 to 1965, Jaeger attended the Second Vatican Council, with Heribert Mühlen serving as his peritus, or theological expert.

[1] The Archbishop claimed that the Church had come to the "end of the Constantinian era," and needed to update the presentation of its teachings as time progressed.

A dedicated ecumenist, Jäger founded the Johann Adam Möhler Ecumenical Institute (named after the German theologian) and helped establish, along with Augustin Bea, the Secretariat for Promoting Christian Unity in the Roman Curia.