Latrun Castle, Medieval fortress ruins in Judean Hills, Israel.

Latrun Castle is a Crusader fortress ruin on a hill 261 metres above sea level in the Judean Hills, about 250 metres south-east of the Monastery of the Silent Monks. Surveys have revealed a keep, a cellar, remains of walls, arches, towers and a church. From the hilltop there is a panoramic view of the Jerusalem hills, the Shephelah, Highway 1 and the Ayalon Valley.

The first tower was erected in 1132 or 1137; in 1141 the site passed to the Knights Templar, who built a large fortress called Le Toron des Chevaliers, the source of the name Latrun. Saladin's armies destroyed it in 1187. The Crusaders retook the place in 1229 during the Sixth Crusade, though it is unknown whether they rebuilt the fortress, and by the mid-13th century they had been driven out.

The name Latrun comes from Le Toron des Chevaliers, "Tower of the Knights", the name the Templars gave the fortress in 1141; local speech reshaped it into Latrun. The hilltop also holds the memorial of the Sa'ar Division, east of the Crusader remains, and the surrounding olive groves belong to the nearby Silent Monastery.

The site is accessible by the main highway between Tel Aviv and Jerusalem with parking available at the entrance. Wear sturdy shoes since the ruins are uneven and winds can be strong on the hilltop.

The castle's name comes from "Le Toron des Chevaliers", the Knights' Tower, which local speech turned into Latrun. Surveys of the site have found a keep and a cellar, along with remains of a wall, arches, towers and a church. East of the ruins stands the memorial of the Sa'ar Division.