Capel Lligwy is a ruined chapel near Rhos Lligwy in Anglesey, north Wales, dating back to the first half of the 12th century. The chapel's original purpose is unknown, but it might have been used as a memorial chapel or in connection with a local royal court, or as a chapel of ease in a large parish with a growing population. It was used for a time until the early 18th century as a private place of worship for a nearby house, then later fell into disrepair. The walls still remain, with some traces of render on them internally, but there is no roof.