Saint Illtyd's Walk is a 64-mile-long (103 km) waymarked long-distance footpath in South Wales.

[1] The walk is named after Illtyd (or Illtud), a late-fifth / early-sixth century Welsh saint.

The route skirts the fringes of Burry Port, heading east to the Lliedi reservoirs then to Pontarddulais.

The route then climbs east over the northern end of the Mynydd Marchywel ridge and down to cross the River Dulais at Crynant.

Colin Davies, who devised the route, authored a guidebook the same year detailing the walk.