In 1968, Pope Paul VI was head of the Catholic Church.
Pope John XXIII was pope between 1958 and 1963.
Pope John XXIII was pope 1958 to 1963
Pope Pius XII was pope from 1939 to 1958.
There is no pope named Pope XXIII. If you are referring to Pope John XXIII, he became pope in 1958.
Pius XII was pope from 1939-1958.
Pope John XXIII was bishop during those years.
The Pope in January 1961 was Pope John XXIII. He served as Pope from 1958 until his death in 1963.
Pope Pius XI (1922-1939)Pope Pius XII (1939-1958)Pope John XXIII (1958-1963)Pope Paul VI (1963-1978)Pope John Paul I (August-September 1978)Pope John Paul II (1978-2005)Pope Benedict XVI (2005-2013)Pope Francis (2013-)
If by "leader" you mean "the pope," then the leader of the Catholic Church in 1958 was either Pope Pius XII, who's reign ended in that year, or Pope John XXIII, who succeeded Pope Pius XII in that same year.
Pope John XXIII was ordained pope on October 28th, 1958
Elected: October 28th, 1958 Died: June 3rd, 1963
It was Pius XII. He was pope from Mar. 2, 1939 to his death on Oct. 9, 1958.