There is more than one Pope Pius who have assigned feast days so you should be more specific.
Pope Pius I - Formerly July 11 but suppressed since 1969
St. Pius V - April 30
Blessed Pius IX - February 7
St. Pius X - August 21
Ven. Pope Pius XII - no feast day assigned yet.
There have been 266 popes so you have to narrow down your question to one of them.
He was born on April 16, 1927, which was both a Holy Saturday and Passover.
October 22 is the feast of Pope St. John Paul II.
The birthday of Pope Francis is December 17, 1936.
there are so many popes i cannot count
August 21 is the feast day of Pope Saint Pius X.
Roman Catholic AnswerPope Pius VI does not have a feast day as he has never been declared a saint.
Pius XII was elected on March 2, 1939.
The feast of Christ the King, instituted by pope Pius XI in his encyclical Quas Primas.
12 popes have taken the name "Pius". Some of them were also canonized as saints. Pope Pius I, saint, Pope 140/142 to 155 Pope Pius II, Pope 1458 to 1474 Pope Pius III, Pope in 1503 Pope Pius IV, Pope 1559 to 1565 Pope Pius V, saint, Pope 1566 to 1572 Pope Pius VI, Pope 1775 to 1799 Pope Pius VII, Pope 1800 to 1823 Pope Pius VIII, Pope 1829 to 1830 Pope Pius IX, Pope 1846 to 1878 Pope Pius X, saint, Pope 1903 to 1914 Pope Pius XI, Pope 1922 to 1939 Pope Pius XII, Pope 1939 to 1958
Pope Pius XII followed Pius XI.
It was Pius XII. He was pope from Mar. 2, 1939 to his death on Oct. 9, 1958.
Pope John I has only begun the sainthood process and does not yet have a feast day.
Pope Benedict I is not a saint and has no feast day.
October 22 is his feast day.
Pope Pius I died in 154.
There has never been a Pope Pius XVI. Pius XII was the last pope by that name.