Armenisti lighthouse, Maritime lighthouse at Cape Armenistis, Mykonos, Greece

Armenisti lighthouse is a white octagonal stone tower located on the northwestern coast of Mykonos. The structure was built to guide ships through the waters surrounding the Aegean islands using a rotating light mechanism.

The Armenistis lighthouse was built in 1891, after the British steamship Volta sank off Mykonos in 1887 and eleven crew members drowned. The octagonal stone tower, completed in 1892, was erected to guide ships safely around the island's northwestern coast.

The first lamp used a Fresnel lens made by the French firm Sautter & Lemonnier and stayed in service until 1983, when the lighthouse was automated and switched to electric equipment. The old lens is now displayed in the courtyard of the Aegean Maritime Museum in Mykonos Town.

The lighthouse stands 6 km from Mykonos old port and 4 km from the new port, at the end of a road from Agios Stefanos. The site is exposed to meltemi winds, so bring a windproof layer. The tower is fenced off and not open for climbing; the paved area around it allows close views of the octagonal structure and the Aegean.

During World War II, this location served as a strategic observation post for the German military occupation. Its position between two islands made it valuable for monitoring sea traffic across the Aegean region.