Ntana lighthouse, Protected lighthouse building on the island of Poros, Greece

The Ntana lighthouse, also called the Poros or Dana lighthouse, stands at the western end of the island of Poros in the Saronic Gulf, Greece. It was completed in 1870 as a square stone tower rising above the keeper's house, with a white lantern and dome. Its light stands 31 m above the Aegean Sea in the middle of the gulf.

The lighthouse was completed in 1870 at the western end of Poros, in the Saronic Gulf. Its square stone tower rises above the keeper's house, with a white lantern and dome. From 2012 to 2013 the light was mounted on a metal structure in front of the tower before being returned to the historic building.

The lighthouse building is a reminder of the time when sailors and fishermen depended entirely on such lights to enter the bay safely. For the people of Poros, it stands as a familiar mark on the coast, one that speaks to the island's long connection with the sea.

The lighthouse is about 4 miles (6 km) from Poros Town and can be reached on foot along a marked coastal path that starts near a small beach. The walk is straightforward and does not require any special gear, making it a good option for most visitors.

The light source shifted over the decades from oil to acetylene gas and then to solar power, which means no keeper has been needed on site since 1954. In 2011, the Aikaterini Laskaridis Foundation carried out a full restoration of the structure, bringing it to the state visitors see today.