Samsø (Anglicized: "Samso" or "Samsoe") is a Danish island in the Kattegat 15 kilometers (9.3 mi) off the Jutland Peninsula. Samsø is located in Samsø municipality. The community has 4,300 inhabitants (2009) called Samsingers and is 114 km² in area. Due to its central location, the island was used during the Viking Age as a meeting place. The etymology of the island's name is unknown.

In 1997, Samsø won a government competition to become a model renewable energy community. Now 100% of its electricity comes from wind power.

The island is very popular among French, Welsh and Irish people for strawberry picking during the months of June and July every year. In Denmark, the island is well known for its early harvest of new potatoes. The first few pounds of these potatoes usually fetch prices around £100, and are considered a great delicacy. Ballen's beach and village are popular with visitors. The island is served by a bus service which runs around the island, including the ferry terminals. In clear weather, the peninsula of Helgenæs to the north is visible. Geographically, the island is divided into three areas: