Johannes Gerardus Maria Willebrands (September 4, 1909 – August 2, 2006) was a Dutch Cardinal of the Roman Catholic Church. He served as President of the Pontifical Council for Promoting Christian Unity from 1969 to 1989, and Archbishop of Utrecht from 1975 to 1983. Elevated to the cardinalate in 1969, Willebrands was central to the increased ecumenism of the Church in the second half of the 20th century, and was considered papabile at the two conclaves held in 1978.