Alignements de Lagatjar is a megalithic site located near Camaret-sur-Mer on the Crozon Peninsula in Brittany. The site consists of three rows of standing stones (menhirs), which originally numbered over 600 stones when first recorded in the 17th century. The site probably dates from the late Neolithic .

Many of the stones were removed or destroyed over the centuries. Today, approximately 65 stones remain, some are re-erected to give visitors a sense of the original layout and scale. The purpose of the alignment is not definitively known but is generally thought to have had religious or ceremonial significance, or maybe relating to astronomical observations or territorial markings.