Capel Dewi is a small village in the county of Ceredigion, Wales.

The village lies in the Clettwr Valley mostly on the eastern bank of the River Clettwr, a tributary of the River Teifi.

Capel Dewi is part of the community of Llandysul along with the settlements of Horeb, Pont-Siân, Pren-gwyn, Tregroes, Rhydowen and the village of Llandysul itself.

The village is home to several buildings of note, including the Rock Mill.

The church, which is in the centre of the village, was made a Grade II listed building in 1993.