How to Say "official letter" in Spanish
The Spanish word for “official letter” is “oficio” — C1 level.
English → SpanishC1
nounC1formal
formal communication between institutions

Examples
El juez envió un oficio a la policía para solicitar los informes.
The judge sent an official letter to the police to request the reports.
Tuvimos que responder al oficio del ayuntamiento rápidamente.
We had to respond to the town hall's official document quickly.
Formal Context
This meaning is very specific. You will only encounter 'oficio' used this way when dealing with bureaucracy, government, or legal matters.
Related Translations
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