Howmore lies on the island of South Uist to the southwest of Loch Druidibeg. The mountain of Haarsal rises to 139 m (456 ft) to the east and immediately south is the smaller settlement of Howbeg. Howmore is also within the parish of South Uist.

South Uist is the second-largest island of the Outer Hebrides in Scotland. At the 2011 census, it had a usually resident population of 1,754: a decrease of 64 since 2001. The island, in common with the rest of the Hebrides, is one of the last remaining strongholds of the Gaelic language in Scotland. South Uist's inhabitants are known in Gaelic as Deasaich (Southerners). The population is about 90% Roman Catholic.