Casimiro Gennari (29 December 1839 – 31 January 1914) was an Italian cardinal of the Roman Catholic Church and was former Prefect of the Congregation of the Council.
He was the founder of the monthly Il Monitore Ecclesiastico, to help the clergy be in tune with the teaching of the Church, and was the first of its kind.
He was created Cardinal-Priest of San Marcello on 15 April 1901 by Pope Leo XIII.
[citation needed] Gennari wrote the text of the papal decree Sacra Tridentina Synodus.
[1] He was appointed as Prefect of the Congregation of the Council on 20 October 1908 by Pope Pius, holding the post until his death in 1914.