Pedro Calungsod also known as Pedro Calonsor (born: 1654 – died: 2 April 1672) was a young Roman Catholic Filipino migrant, sacristan and missionary catechist, who along with Blessed Diego Luis de San Vitores, suffered religious persecution andmartyrdom in Guam for their missionary work in 1672.
While in Guam, Calungsod preached Christianity to the Chamorro people through catechism, while baptizing both infants, children and adults at the risk and expense of being persecuted and eventually murdered. Through Calungsod and San Vitores' missionary efforts, many native Chamorros converted to Roman Catholicism.
Calungsod was formally beatified on 5 March 2000 by Blessed Pope John Paul II. On 18 February 2012, Pope Benedict XVI officially announced that Calungsod will be canonisedon 21 October 2012.