Western Way, Long-distance hiking trail in Galway and Mayo, Ireland

The Western Way (Irish: Slí an Iarthair) is a 179-kilometre National Waymarked Trail running from Oughterard, County Galway, to Ballycastle, County Mayo, usually walked in seven days. The Galway section follows the western edge of Lough Corrib, crosses the Maumturks at the Maumeen pass and drops through the Inagh Valley to Leenaun on Killary Harbour. The Mayo section climbs over Sheefry Bridge, passes Westport, Newport, Sheskin, Ballycastle, Killala and Ballina, and ends at Lough Talt in the Ox Mountains near the Sligo border, where the Sligo Way continues.

The Western Way was developed as a waymarked long-distance trail and is now designated a National Waymarked Trail by the National Trails Office of the Irish Sports Council. It is managed jointly by Coillte, Galway County Council, Mayo County Council, South Mayo Development Company and Mayo North & East Development Company. The route links Oughterard with Ballycastle and can be continued onto the Sligo Way.

The trail's Irish name, Slí an Iarthair, means "Way of the West". It is a National Waymarked Trail, and the route passes the pass of Maumeen in the Maumturks and follows the base of the "Turks" to Leenaun at the head of Killary Harbour. From Leenaun the Mayo section runs through Westport, Newport, Ballycastle, Killala and Ballina to Lough Talt in the Ox Mountains.

The trail requires proper hiking gear and advance planning since it spans multiple days and alternates between paved roads and natural paths. Booking accommodation ahead is essential, and walkers should prepare for changeable weather, especially at higher elevations.

The route crosses the Maumturks at Maumeen, a pass where a small chapel and a holy well sit beside the path. Mass has been celebrated at this open-air site on the last Sunday of July, drawing walkers and pilgrims crossing between Galway and Mayo.