Bealach na Bà is a winding single track road through the mountains of the Applecross peninsula, in Wester Ross in the Scottish Highlands. the Bealach na Bà is just one feature on this road, being its highest point and site of several corries. The historic mountain pass was built in 1822 and is engineered similarly to roads through the great mountain passes in the Alps, with very tight hairpin bends that switch back and forth up the hillside and gradients that approach 20%. It has the steepest ascent of any road climb in the UK, rising from sea level at Applecross to 626 metres (2,054 ft), and is the third highest road in Scotland.

The name is Scottish Gaelic for Pass of the Cattle, as it was historically used as a drovers' road. Bealach na Ba is pronounced Bee-al-uch nu Ba(h).

The Bealach, as it is known for short, is considered unsuitable for learner drivers, large vehicles and motorhomes. The route is often impassable in winter.