Llanbedr-y-Cennin is situated in the Conwy Valley, North Wales. Set on the foothills of the mountains of the Snowdonia National Park, Llanbedr y Cennin is dominated by the Pen y Gadair mountain at 496m, and Pen y Gastell at 623m. In the hills behind the village are roads and hill-walking tracks giving access to the hills and lakes of the Snowdonia National Park. The sign outside the Olde Bull Inn public house is a landmark in the Conwy Valley, and the restaurant has a good reputation too!

Llanbedr y Cennin is bordered on two sides by the Afon Dulyn and Afon Roe, to the south and north respectively. Both enter into the renowned Conwy River 3.8km east of the village. The Iron Age hillfort of Pen y Gaer is 1km west of the village, a waterfall 1.5km south west of the village. The villages of Tal y Bont and Dolgarrog are to the south and Tyn y Groes to the north of Llanbedr-y-Cennin.