Crossbasket Linn is a waterfall on the Rotten Calder, a river in South Lanarkshire, Scotland. It sits among a notable series of falls that punctuate the Rotten Calder's course as the river cuts through a steep, wooded gorge on its way to join the River Clyde.

The waterfall takes its name from nearby Crossbasket Castle, past which the Rotten Calder flows before continuing through the former estates of Greenhall and Milheugh.

According to the downstream sequence of falls, Crossbasket Linn lies between Calderwood Linn (also known as Castle Falls) and Milheugh Falls.

The gorge through which these waterfalls flow was historically celebrated in books and poems for its scenic grandeur and ivy-clad crags.