Alacahöyük, Archaeological complex in Çorum Province, Turkey.

Alacahöyük is an archaeological excavation site in Çorum Province containing remains from multiple periods layered one above another. It features building foundations, a monumental gateway flanked by sphinx sculptures, and stone carvings showing hunting scenes and ceremonial processions.

The mound shows human occupation spanning more than 3,000 years, from the early Bronze Age through the Iron Age. The successive layers document the transformation from small village communities into a significant center during the Hittite period.

The site's original name was İmat Höyük; it is called Alacahöyük because the nearest town is Alaca. The Hittite name is unknown, though Arinna has been suggested. The Sphinx Gate figures were believed to ward off evil, and some stone reliefs show musicians.

The mound lies near the village of Alacahüyük, about 15 km northwest of Alaca in Çorum Province, northeast of Boğazkale. Finds are split between the Alacahöyük Museum, opened in 1941, and the Museum of Anatolian Civilizations in Ankara. The site and Boğazköy were declared Boğazköy-Alacahöyük National Park in 1988.

The mound's Hittite name is unknown; texts found at Boğazköy mention Arinna, city of the sun goddess, and scholars have proposed identifying it with Alacahöyük or a place nearby. A letter records a golden sun disk inherited from the grandfathers.