Crosthwaite and Lyth is a civil parish in the Westmorland and Furness district of Cumbria, England.
It contains 38 listed buildings that are recorded in the National Heritage List for England.
The parish is in the Lake District National Park.
It contains the villages and smaller settlements of Crosthwaite, Crosthwaite Green and Rowe, and is otherwise rural.
The other listed buildings include bridges, limekilns, a corn mill and ancillary buildings, a former school, a mill dam and associated structures, and a church.