Campanula shetleri is a rare species of bellflower known by the common name Castle Crags bellflower. The plant is named for Castle Crags, a mountain formation in its limited native range, within the Shasta-Trinity National Forest.

It is endemic to California, where it is known from fewer than ten occurrences in the southern reaches of the Cascade Range near the border between Siskiyou and Shasta Counties.

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