Horse Island is the name of several places, including:
Canada Horse Islands (Newfoundland and Labrador) Horse Island (Lake Winnipeg), Manitoba
Ireland Horse Island, County Clare Horse Island, County Cork Horse Island, County Kerry
United Kingdom Northern Ireland Horse Island, County Down, a townland of County Down Horse Island, County Fermanagh, a townland of County Fermanagh
Scotland Eilean nan Each (Horse Island), one of the Small Isles off the coast of Skye Horse Isle in the Firth of Clyde, North Ayrshire Horse Island, Summer Isles in the Summer Isles Horse Holm in the Shetland Islands, sometimes shown as Horse Island
United States Horse Island (Connecticut) Horse Island (Maryland) Horse Island (Michigan) Horse Island (New Mexico) Horse Island (New York), site of the Horse Island Light in Sackets Harbor, New York Horse Island (Rockville, South Carolina), listed in the National Register of Historic Places Horse Island (Texas)
See also Wild Horse Island, Montana Hrossey (meaning "horse island"), the old name of Mainland, Orkney, Scotland Eilean nan Each (Horse Island), Small Isles, Scotland Hestur ("Horse" in Faroese), an island in the Faroe Islands Horsey Island (disambiguation)