St Tyfi's Church, Llandyfeisant

St Tyfi's Church is the former parish church of Llandyfeisant, near Llandeilo and part of the Dinefwr Park estate in Carmarthenshire, Wales. It was dedicated to the Welsh saint Tyfei. The building is no longer used for religious purposes and has been adapted as a visitor interpretation centre for the estate, which is now the Dinefwr Park National Nature Reserve. Newton House, the main residence on the estate, is a Grade II*-listed country house.

The small stone church was first constructed in medieval times, but was almost entirely rebuilt in the second half of the nineteenth century. The architect may have been R. Kyrke Pearson from Oswestry, who redesigned Newton House for Lord Dynevor. The exterior has rubble-stone facings, gable parapets and a stone slate roof. The interior has an open, arched-brace roof with collar-beams and stone corbels. The building was listed at Grade II on 18 March 1988, as a "church of moderate architectural interest in an exceptional location at Dynevor Park, with a fine steeply sloping burial ground with old headstones".