Llithfaen is a small village on the Llŷn Peninsula in Gwynedd, Wales. It is located around 4 miles north-east of Nefyn and lies just south-west of Yr Eifl mountains, on the B4417 road from Llanaelhaearn to Nefyn. Formerly in the parish of Nant Gwrtheyrn, it is now in the Pistyll community.