Fulgens corona is an encyclical by Pope Pius XII, given at St. Peter's, Rome, on 8 September 1953, the Feast of the Nativity of the Blessed Virgin Mary, in the fifteenth year of his Pontificate. The encyclical proclaims a Marian year for 1954, to commemorate the centenary of the definition of the dogma of the Immaculate Conception of the Virgin Mary.

A Marian year is a designation given by the Catholic Church to calendar years in which Mary the mother of Jesus is to be particularly reverenced and celebrated. Marian years do not follow a set pattern; they may be declared by a bishop for his diocese, or a national conference of bishops for a country.