Missionaries
- Gabriele Allegra, O.F.M. – missionary to China to translate the Bible
- Francisco Álvares – Portuguese missionary to Ethiopia.
- Saint Amand – missionary of Flanders
- José de Anchieta – Spanish missionary in Brazil
- Alexis Bachelot – missionary to Hawaii
- Alonzo de Barcena – missionary and linguist
- Carlos Filipe Ximenes Belo – missionary in Mozambique
- Jean-Rémy Bessieux – missionary to Gabon and its first bishop
- Giacomo Bini – Franciscan missionary to Rwanda
- Libert H. Boeynaems – missionary to Hawaii
- Luis de Bolaños – missionary who started the Indian Reductions system in Paraguay
- François Bourgade – one of the first Christian missionaries to Muslim North Africa
- Jean de Brébeuf – French Jesuit martyr in Canada who wrote "Huron Carol"
- Luis Cancer – missionary in Hispañola, Central America and Florida
- Saint Daniele Comboni – Italian bishop and missionary to Africa
- Peter of Saint Joseph de Betancur – Spanish missionary in Guatemala
- Father Damien – missionary to Hawaii known for working with the lepers
- Anton Docher – French missionary in New Mexico, defender of the Native Americans
- Louis William Valentine Dubourg – missionary to the US
- Francis Xavier Ford – missionary to China, martyr and Servant of God
- Joseph Freinademetz – nineteenth-century canonized missionary to China
- René Goupil – French missionary to what is now Canada
- Évariste Régis Huc – French missionary in nineteenth century China
- Isaac Jogues – French missionary to what is now Canada
- John of Montecorvino – Franciscan missionary to China in Medieval times
- Jordanus – Dominican missionary to India
- Peter Richard Kenrick – Irish missionary to the US
- Eusebio Kino – pioneer Jesuit missionary and explorer to what is now Baja California, Northwest Mexico, and the southwest US
- Fermín Lasuén – founder of numerous missions in Baja California
- Segundo Llorente – Spanish missionary to Alaska
- Jacques Marquette – missionary and explorer
- Peter Hildebrand Meienberg – missionary to East Africa
- Victor Mosele – missionary to Sierra Leone
- Saint Ninian – missionary of Scotland
- Marcos de Niza – French Franciscan missionary who accompanied Francisco Vásquez de Coronado
- Roberto de Nobili – Jesuit missionary in India who learned Tamil and Sanskrit
- Odoric of Pordenone – Franciscan missionary to China in Medieval times
- Juan de Padilla – Franciscan who accompanied Coronado
- Alexander de Rhodes – French Jesuit important to the history of Christianity in Vietnam
- Matteo Ricci – Jesuit missionary in China
- Junípero Serra – founded the mission system of what is now the US state of California
- Mother Teresa – missionary to India
- Alessandro Valignano – Italian Jesuit who supervised missions in the Far East, particularly Japan
- Józef Wojaczek
- William of Rubruck – Franciscan missionary to the Mongols
- Francis Xavier – Jesuit missionary to India and Japan
- Padre Antonio Vieira – Portuguese Jesuit missionary to Brazil and South America, converted Indians in South America; called the Great Father of the indegian people in South America, was against the inquisition, and probably is one of the biggest converters of people to Roman Catholic faith