Spanish language

The Spanish language was a Human language originating in the Earth region of Spain and spoken by the Spanish. The language was also widely used in North and South America.

When Hoshi Sato had difficulties to communicate with an Axanar in his native language in 2151, she told Jonathan Archer that it wasn't just Spanish she was dealing with. (ENT: "Fight or Flight")

Sato began speaking Spanish when she attempted to break the lockout code in the decon chamber in 2154 while under the effects of a silicon-based virus. (ENT: "Observer Effect")

Spanish was among the 94 languages Commander Saru spoke. In 2257, during a malfunction of the universal translator aboard USS Discovery, Commander Michael Burnham's speech was translated into Spanish, which Saru was able to understand and respond in. (DIS: "An Obol for Charon")

The Spanish word "mariposa" translated into English as "butterfly", a fact which Data mentioned in a conversation with Jean-Luc Picard in 2365. (TNG: "Up The Long Ladder")

Crewman Enrique Muniz began speaking Spanish while in a delusional state shortly before his death in 2373. (DS9: "The Ship")

Cristóbal Rios was a fluent speaker of Spanish and sometimes used it with his ship's hologram. (PIC: "Absolute Candor")

Spanish-named starships

El traductor universal ha sido invadido por un virus. Está traduciendo todo a un idioma diferente.: The universal translator's been invaded by a virus. It's translating everything into a different language.
Tengo ojos y oídos, Burnham.: I have eyes and ears, Burnham. (DIS: "An Obol for Charon")