St. David's Church (or Llanfaes Church; Llandewi yn y Maes [St. David's in the Field]) is located in Brecon, Powys, Mid Wales.

The fabric consists of a chancel, nave, and a tower at the west end in which are six bells.

In the aisle and chancel there used to be several stones to the memory of departed: one to John ab Rees, of Penderrin (1621), Saunders John Thomas ab leuan Llwyd (1621), Edward Williams, of Ffrwdgrech (Ki67), Margaret, wife of Walter Watkins, of Brecknock, gent., and daughter and sole heiress of Watkin John, of Heolfanog (1700); David Lloyd, of Caerau (1727), his son Peter (1745), and his wife Magdalen (1742), and other stones to the Lloyds bearing the dates 1788, 1748, 1785.

This church was last restored in 1859, at a cost of £1,500, and contains a memorial window given by the late Colonel and Mrs. Church Pearce, in memory of their son.

In 1808 three-quarters of an acre of land was consecrated for burial ground purposes by the Bishop of St. David's.