Crantzia is a plant genus in the family Gesneriaceae.

Crantzia species grow in damp or wet forests, mostly on Caribbean islands.

Some are epiphytes, others are subshrubs or herbaceous plants with fibrous roots.

[3] Several taxa from the Gesneriaceae genus Alloplectus have been reclassified as Crantzia.

Giovanni Antonio Scopoli named the genus after botanist and physician Heinrich Johann Nepomuk von Crantz (1722–1799).