Hans Hermann Wilhelm Groër OSB (13 October 1919 – 24 March 2003) was an Austrian Cardinal of the Roman Catholic Church.

He attended seminaries in Hollabrunn and Vienna (where he received his doctorate in theology) before being ordained to the priesthood on 12 April 1942 by Cardinal Theodor Innitzer.

Groër received his episcopal consecration on the following 14 September from König, with Archbishop Karl Berg and Bishop Stefan László serving as co-consecrators.

He was created Cardinal Priest of Santi Gioacchino ed Anna al Tuscolano by Pope John Paul II in the consistory of 28 June 1988.

Pope John Paul II promoted Christoph Schönborn from auxiliary bishop to Coadjutor Archbishop of Vienna on 13 April 1995 and later in the year accepted the resignation Groër had submitted as required on his 75th birthday in October 1994.

Cardinal Schönborn presided at the requiem Mass in St. Stephen's Cathedral and in his homily honoured his predecessor's accomplishments in strengthening Marian devotions in the Archdiocese as well as fostering priestly and monastic vocations.