Bocan Stone Circle is a Neolithic/Bronze Age monument that has a diameter of about 18.3 metres. It has the remains of a ring cairn with seven large stones still standing. Others, of would have been a circle of around 30 stones, are now fallen. Two bigger stones mark the entrance. It is located near the village of Culdaff (Irish: Cúil Dabhcha) on the Inishowen (Irish: Inis Eoghain) peninsula , in County Donegal, Ireland (Irish: Contae Dhún na nGall, Éire). It is off the R238 road south of Culdaff at Bocan.