Sobralia rhizophorae, from the mangroves of Reserva Ecológica Manglares Cayapas-Mataje (REMACAM) in northwestern Ecuador, is described and illustrated. The new species is characterized by stems with a terminal, cone-like inflorescence bearing white flowers, produced singly in succession, and the obovate labellum with five parallel longitudinal keels, a yellowish-brown spot within, and a heavily undulate margin at the distal third.