Trial Islands Lighthouse, Light station in Oak Bay, Canada.

Trial Islands Lighthouse stands on the highest point of the major Trial Island in the Strait of Juan de Fuca, off Oak Bay. The current 1970 structure is a 13 m white cylindrical concrete tower with a gallery and a red lantern. It shows a green flash every five seconds at a focal height of 28 m, with a nominal range of about 17 nautical miles (31 km). The keepers' dwelling sits a few metres from the tower.

The first lighthouse was built in 1906 and fitted with a fourth-order Fresnel lens. That lens served until 1970, when the present tower was erected and the light was automated. The original lens was later displayed at the Maritime Museum of British Columbia in Bastion Square, Victoria, before being moved into Coast Guard storage. In 2015 the lighthouse was granted heritage status under the Heritage Lighthouse Protection Act.

The light is a green flash every five seconds, shown from a focal height of 28 metres and visible about 31 km out. The 1906 fourth-order Fresnel lens served until 1970 and was later displayed at the Maritime Museum of British Columbia in Bastion Square, Victoria, before going into Coast Guard storage.

The lighthouse sits on remote islands accessible only by boat and cannot be reached on foot. The best way to view it is from the water or from nearby coastal viewing spots on the mainland.

The 1906 fourth-order Fresnel lens stayed in use until 1970, when the current tower replaced the original lighthouse. The old lens was later displayed at the Maritime Museum of British Columbia in Bastion Square, Victoria, before being moved into Coast Guard storage.