Loughrigg Tarn () is a small, natural lake in the Lake District, Cumbria, England. It is situated north of Windermere, just north of the village of Skelwith Bridge, and at the foot of Loughrigg Fell. Loughrigg Tarn is a bit of a tautology, since loughrigg means ridge of the lough (lake) and tarn is also the name of a body of water.