Trough Linn is a waterfall on the Rotten Calder, a river flowing through South Lanarkshire east of East Kilbride.

It is one of several named falls along this watercourse, which also includes Flatt Linn, Black Linn, Torrance Linn, and Calderwood Linn, among others. The falls sit near Laighlyock Farm, close to the boundary of Calderglen Country Park.

A woodland creation project in the area planted nearly 38,000 broadleaved and coniferous trees — including priority species such as Juniper and Aspen — across an 18.

86-hectare site along the Rotten Calder's edge, with the longer-term aim of extending the park's path network to connect with Blantyre Parish via a future bridge crossing near the linn.