Holy Trinity Church is in the village of Casterton, Cumbria, England. It is an active Anglican parish church in the deanery of Kendal, the archdeaconry of Westmorland and Furness, and the diocese of Carlisle. Its benefice is united with those of five local parishes, the benefice being entitled Kirkby Lonsdale Team Ministry. The church is recorded in the National Heritage List for England as a designated Grade II listed building.