Saint Martin may refer to:

• Martin of Vienne (c. 250 – ?), legendary third bishop of Vienne, France
• Martin of Tours (c. 316–397), Bishop of Tours, France
• Martin of Braga (c. 520–580), archbishop of Bracara Augusta in Gallaecia (now Braga in Portugal)
• Pope Martin I (c. 595–655), bishop of Rome
• Martin of Arades (died 726), monk in Corbie Abbey
• Martin of Soure (died 1146), Portuguese cleric canonized after martyrdom to the Moors of Cordoba
• Martin de Porres (1579–1639), Peruvian lay brother of the Dominican Order
• Martin Tho and Martin Tinh Duc Ta, two Vietnamese Martyrs who died between 1745 and 1862

• Alexis St. Martin (1802–1880), Canadian voyageur
• Fernande Saint-Martin (1927–2019), Canadian art critic, museologist, semiologist, visual arts theorist and writer
• Louis Claude de Saint-Martin (1743–1803), French mystic philosopher
• Louis St. Martin (1820–1893), American politician from Louisiana
• Paul Saint-Martin (1901–1940), French politician

• St. Martin's Island, an island in Chittagong

• Saint-Martin, Quebec, a parish municipality in the province of Quebec
• Saint-Martin, Laval, Quebec, a residential section of the city of Laval in Quebec

• Saint-Martin, Bas-Rhin
• Saint-Martin, Gers
• Saint-Martin, Hautes-Pyrénées
• Saint-Martin, Meurthe-et-Moselle
• Saint-Martin-d'Ardèche, Ardèche département
• Saint-Martin-de-Fenouillet, Pyrénées-Orientales département
• Saint-Martin-de-Belleville, Savoie département
• Saint-Martin-de-Pallières, Var département
• Saint-Martin-de-Ré, Charente-Maritime département
• Saint-Martin-sur-Oust, Morbihan département

• Saint-Martin, Fribourg
• St. Martin, Graubünden
• Saint-Martin, Valais

• Fornham St Martin, a village and parish in Suffolk
• St Martin-by-Looe, a civil parish in Cornwall, which doesn't contain St Martin
• St Martin-in-Meneage, Cornwall
• St Martin, Looe, a hamlet in the parish of Looe, the location of St Martin's Church
• St Martin's, Isles of Scilly
• Trimley St Martin, Suffolk
• Wareham St Martin, Dorset

• Saint Martin, Guernsey
• St Martin, Jersey

• St. Martin Parish, Louisiana
• St. Martin Island, Michigan
• St. Martin, Minnesota
• St. Martin Township, Stearns County, Minnesota
• St. Martin, Mississippi
• St. Martin, Ohio

• Saint Martin (island), an island in the northeast Caribbean, divided between France and the Netherlands
  • Collectivity of Saint Martin, French portion of the island
  • Sint Maarten, Dutch portion of the island
• St. Martin's Island, a small island in the Bay of Bengal, Bangladesh
• Saint Martin of the Tigers, ghost town in southern Angola
• Saint Martin, a village in Freudenburg, Magdalensberg, Austria

• St Martin de Porres, Adelaide, a Catholic school in Adelaide, South Australia
• St. Martin Secondary School, a school in Mississauga, Ontario, Canada
• St. Martin High School, a school located in Ocean Springs, Mississippi

• Saint-Martin station (Laval, Quebec), a former commuter rail station in Canada
• Saint-Martin station (Paris Métro), a former Paris Métro station
• Saint-Martin-d'Étampes station, a railroad station in Étampes, Essonne, France
• Caen Saint-Martin station, a former railroad station in Caen, France
• San Martin station, a commuter rail station in San Martin, California, US

• Saint Martin (grape) or Enfariné noir, a French wine grape
• San Martin Txiki, a figure in Basque mythology
• St. Martin Island Light, a lighthouse in Michigan
• Villa Saint Martin, a centre in Ignatian spirituality in Montreal, Canada

• Candes-Saint-Martin, in the Indre-et-Loire département, place where Saint Martin of Tours died
• St. Martin de Clare, Nova Scotia
• St Martin-in-the-Fields, an Anglican church in London
• St. Martin's (disambiguation)
• St. Martin's Church (disambiguation)
• St. Martin's Day, a feast on November 11, of St Martin of Tours
• Saint Martin Island (disambiguation)
• Saint-Martin-Vésubie in the Alpes Maritimes département
• San Martín (disambiguation)
• Sankt Martin (disambiguation)
• São Martinho (disambiguation)
• Sint Maarten (disambiguation)