Bealach na Bà (pronounced [bjaLəx na baː]) 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 greatest ascent of any road climb in the United Kingdom, rising from sea level at Applecross to 626 m (2,054 ft) in about 6 km (3.7 mi), 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.

The Bealach, as it is known for short, is considered unsuitable for learner drivers and very large vehicles. The route is often impassable in winter. According to Country Life, "the single-track, historic drovers' lane travels up, down and around hairpins through the mountains of the remote Applecross peninsula as if they were the Alps and, at Bealach na Bà ('pass of the cattle'), features the steepest ascent of any road in the UK".