Saint Martin is a parish in Guernsey, The Channel Islands. The islands lie in the English Channel between Great Britain and France.

The old Guernésiais nickname for people from Saint Martin is dravans.

In 1883, Pierre-Auguste Renoir spent the summer in Guernsey, with a varied landscape of beaches, cliffs and bays, where he created fifteen paintings in little over a month. Most of these feature Moulin Huet, a bay in Saint Martin. These paintings were the subject of a set of commemorative postage stamps issued by the Bailiwick of Guernsey in 1983.

The parish church of Saint Martin was consecrated on 4 February 1199. At the gate to the churchyard is La Gran'mère du Chimquière, a statue menhir.

St. Martin Parish has entered Britain in Bloom for a number of years, winning the small town category twice, in 2006 and 2011.

Saint Martin is located in the southeast of Guernsey. The parish borders the Forest on the southwest, Saint Andrew northwest, and Saint Peter Port on the northeast. Saint Martin also has a very small detachment to the west. The detachment is an exclave which is not contiguous with the rest of the parish.