Romeo Roy Blanchette (January 6, 1913 – January 10, 1982) was an American clergyman of the Roman Catholic Church. He served as Bishop of Joliet from 1966 to 1979.
Romeo Blanchette was born in Kankakee County, Illinois, to Oscar and Josephine (née Langlois) Blanchette. After attending Archbishop Quigley Preparatory Seminary in Chicago from 1928 to 1931, he studied at St. Mary of the Lake Seminary in Mundelein, from where he obtained a Bachelor of Arts degree in 1934. He was ordained to the priesthood by Cardinal George Mundelein on April 3, 1937, upon the recommendation of rector Reynold Henry Hillenbrand.
He continued his studies in Rome at the Pontifical Gregorian University, earning a Licentiate of Canon Law in 1939. Blanchette was a notary of the matrimonial court in the Archdiocese of Chicago (1938-1949) when Bishop Martin Dewey McNamara brought him to the newly established Diocese of Joliet, where he was made chancellor. In 1950, he was named vicar general of the diocese and a domestic prelate.