Lligwy Bay (Welsh: Traeth Lligwy) is a bay of the Welsh island of Anglesey.
It was the site, in October 1859, of the loss of the steam clipper Royal Charter with a loss of life in excess of 450.
The bay is very popular with windsurfers and other wind-powered watersport enthusiasts.
There is a pay and display car park at the end of the access road from the A5025 at Brynrefail.
The beach is the site of a medieval fish weir, which was scheduled as an Ancient Monument in 2002.