Llangwyllog is a small village and ancient parish in the centre of Anglesey, Wales. It is found three miles to the north of the island's capital, Llangefni, and two miles north of Llyn Cefni, the island's second largest body of water. The settlement was once far more important than it is today, reaching a population of 277 in 1821, whereas the 1971 census showed only 75 people living there. The Anglesey Central Railway used to operate a station in the village until its closure in 1993. The tracks however still run through the village and there is a significant railway cutting in the village.