Kilmacthomas or Kilmactomas (Irish: Coill Mhic Thomáisín),[2] often referred to locally as "Kilmac",[3] is a town on the River Mahon in County Waterford, Ireland.

He was briefly appointed as parish clerk, but it is said that when the Vicar and parishioners discovered how great a rake he was, Donnchadh Ruadh was dismissed and converted back to Catholicism.

Although the last passenger services ceased in the late 1960s the railway continued to operate with the haulage of oil and magnesite for another couple of decades.

The postal area of Kilmacthomas can include Newtown (Baile Nua), Ballylaneen (Baile Uí Fhlaithnín), Lemybrien (Léim Uí Bhriain), Kill (An Chill), Mahon Bridge (Droichead na Machan), The Nire (Gleann na hUidhre), and Kilrossanty (Cill Rosanta).

West of the village are the foothills of the Comeragh mountains, while five miles to the south is the 'Copper Coast' with the beach of Bonmahon / Bunmahon (Bun Machan).

The (Kilmac') Convent Primary school caters for younger children, which is a mile away and has 100 students while the preschool boys and girls attend the Naíonra on the High Road.