Lamb Holm is a small uninhabited island in Orkney, Scotland. The remarkable Italian Chapel, constructed during the Second World War, is the island's main attraction.

Lamb Holm lies in Holm Sound, one of the eastern entrances to Scapa Flow, between Mainland, Orkney and the island of Burray, It is 40 hectares (0.15 sq mi) in area.

The Churchill Barriers carry the road from South Ronaldsay to Mainland, Orkney. Lamb Holm is connected to Glims Holm, to the southwest, by Barrier number 2, and to Mainland by Barrier number 1.

The quarry used to build the Churchill Barriers has now been flooded and converted into a fish farm.

Built by Italian prisoners of war during World War II, the highly ornamented Italian Chapel is now the island's main attraction.

In 1942, more than 1300 Italian prisoners of war were captured in North Africa and taken to Orkney, where they remained until early 1945. 550 were taken to Camp 60, where they were put to work building the Churchill Barriers, four causeways created to block access to Scapa Flow.