Beinn an Lochain is a mountain in the Arrochar Alps in western Scotland. A Corbett, reaching 901.7 metres (2,958 ft), Beinn an Lochain is situated within the Argyll Forest Park, which is itself within the Loch Lomond and the Trossachs National Park.

Although included in Sir Hugh Munro's original list of Scottish mountains over 3,000 feet (914.4 metres) summit elevation, subsequent surveys showed it to be significantly shorter than this. Nonetheless, it remains a popular mountain, and is often quoted as an example of an interesting mountain below the Munro threshold to show that there is more to mountaineering in Scotland than just Munro-bagging.

Beinn an Lochain is usually climbed from the car park at Butter Bridge, on the A83, in Glen Kinglas. From there, the summit is reached after a 2.5 kilometres (1.6 mi) walk along the mountain's north-east ridge, climbing over 700 metres (2,300 ft). The mountain trail offers views of Loch Restil and the pass between Glen Croe and Glen Kinglas.

• List of Corbett mountains

• Map sources for Beinn an Lochain

56°13′49″N 4°52′35″W / 56.23015°N 4.87631°W / 56.23015; -4.87631

• Argyll Forest Park - Official Website
• Loch Lomond and Trossachs National Park, Cowal - Official Webpage