Fine interior with the two sections divided by a timber colonnade of c1733. Nave 9-bay late medieval roof with cusped windbraces, arch-braced collar trusses with angle struts above, some timbers chamfered, some hollow-moulded. Last 2 bays were formerly ceiled and timbers are further ornamented. Nave has pine pews and slate floor slabs. Unusual C18 marble bowl font on baluster stem, inscribed 'Rhodd Edward Thelwell o Llanbeder 1734'. Pulpit of c1870, presumably by J Douglas, timber, octagonal with carved band of leaf and rose decoration over arched panel. Stone base. Eagle lectern of c1870. Encaustic tiles and slate floor in chancel, altar and reredos of 1942, E window stained glass of Ascension, c1926, by W Glasby of London, N window patterned glass with symbols of Evangelists, 1870. Pine stalls of c1870. Outstanding hanging late medieval chandelier, hexagonal stem with 3 tiers of 6 branches, crocketted decoration and statuette of the Virgin, late C15 or early C16.
Memorials: chancel brass plaque to Wilson Jones of Gelligynan, d1864, nave brass plaque to the Rev H Pennant, d1731. W memorials to the Rev Simon Evans d1753, slate and marble with cherub and skull; the Rev J Venables d1782; the Jones family of Plasynpant 1727-66 and to Elizabeth Williams of Bodidris d1799. Also crude pedimented memorial to J Jones of Plasdu, d1835.
Colonnade is of 5 bays with thick octagonal oak columns, classical moulded caps. Diagonal bracing to timber valley beam presumably added in 1870. Broad plaster cove moulding above. S aisle has similar 9-bay roof, with traces of ceiling in last 2 bays. Windows have original iron inner bars supporting the leading. W end used as vestry. Painted royal arms signed 1740 by David Davies on S wall. E end organ by Conacher of Huddersfield.
Memorials: two medieval effigies on floor: one of a priest, worn, early C14, the other, of high quality, of Gruffudd ap Llywelyn ab Ynyr of Bodidris c1320, in armour on tomb chest with trefoil arcading. S wall: Outstanding Stuart effigy memorial to Evan Lloyd of Yal (Bodidris), 1639, triple arched with effigy appearing in outer arches and centre plaque with inscription unusually in Welsh (similar to the John Trevor of Trefalun monument at Gresford); marble Baroque monument with cherub heads to Sir Evan Lloyd of Bodidris, d1700 with arms and cherub heads; crude Baroque memorial with draped plaque in painted stone to Jane Davies of Bwlch Iarll d1723. In vestry painted wood plaque to Evan Davies of Reryrys d1759, marble plaque to Evan Jones d1743, and crude pedimented plaque to W Jones of Ty Isaf d1813. W window stained glass, St German, c1921, by A L and C E Moore.