Green Lowther is a Graham of 732.5 m in South Lanarkshire. It is the highest of the 3 register hills recorded in South Lanarkshire; the next is Tinto at 711.6 m, 20.9 m lower.
It overtops all four of its nearest neighbours; the tallest of them, Queensberry, reaches 697.1 m. On the Grahams height ladder it sits between Stob an Eas (732.6 m) and Sgurr a' Gharaidh (732.3 m). The higher hill nearest to it, Hart Fell, is a Corbett, 21.3 km to the east. The summit is marked by a trig point. It falls on two OS 1:50,000 sheets, 71 and 78.
