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St Mark's Church, Brithdir, is a redundant church in the hamlet of Brithdir, Gwynedd, Wales. It is designated by Cadw as a Grade I listed building, and is under the care of the Friends of Friendless Churches. It is considered to be one of the finest Arts and Crafts churches in Wales.

Brithdir is a small hamlet on the outskirts of Dolgellau, Gwynedd in the community of Brithdir and Llanfachreth.The Arts and Crafts Movement St Mark's Church is a grade I listed building. Brithdir also includes a village hall, a phone box and a children's nursery.