Penysarn (/pɛnˈsɑːrn/; Welsh pronunciation: [pɛnˈsarn]) is a small village located within the community of Llaneilian, in the north-eastern corner of Anglesey, Wales.

[2] Penysarn grew throughout the 18th century, close to what was once the world's largest copper mine, located at Parys Mountain.

[5][6] The village's early expansion was principally due to employment opportunities created by the busy mines and from providing ancillary services such as clog-making, blacksmithing and baking.

Several light industrial companies existed in Penysarn until the 1990s, but employment today is largely limited to core services, such as the village shop and school.

Tourism has brought some business opportunities, with the creation of a small camping and caravan site and several properties being rented out as holiday cottages, but most workers living in Penysarn today commute to local towns for work.