St Maethlu's Church is a medieval church in the village of Llanfaethlu, Anglesey, Wales. It is one of a number of churches in the parish and benefice of Bro Padrig, the appointed clergyman being the Reverend T. J. Jones. The building dates from the 15th century and underwent renovations in the early twentieth century. It was designated a Grade II*-listed building on 4 May 1971.