Castelnavia is a genus of flowering plants belonging to the family Podostemaceae.

Its native range is Brazil.

Species:

• Castelnavia cuneifolia P.Royen
• Castelnavia fimbriata Tul. & Wedd.
• Castelnavia fluitans Tul. & Wedd.
• Castelnavia lindmaniana Warm.
• Castelnavia monandra Tul. & Wedd.
• Castelnavia multipartita Tul. & Wedd.
• Castelnavia noveloi C.T.Philbrick & C.P.Bove
• Castelnavia orthocarpa Tul. & Wedd.
• Castelnavia pendulosa (C.T.Philbrick & C.P.Bove) C.T.Philbrick & C.P.Bove
• Castelnavia princeps Tul. & Wedd.
• Castelnavia pusillina Tul. & Wedd.
• Castelnavia serpens Tul. & Wedd.

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