Pierre Dialan is a menhir located in the commune of Plouhinec in northwestern France. Standing at over 7 meters tall, it is one of the tallest menhirs in the region and dates back to the Neolithic period, around 3000 BCE. Like other menhirs, its purpose is unclear, but it is believed to have had religious or ceremonial significance for the people who built it. The site is also known for its association with local legends and folklore.