The working language(s) of UNESCO is/are

Concept: International organizations commonly distinguish between "official languages" — the full set recognized for authoritative texts, records, and formal proceedings — and "working languages" — a smaller, practical subset actually used for day-to-day internal business, secretariat correspondence, and routine administration. An organization can recognize many official languages while its secretariat operates in only one or two working languages.

Application: UNESCO recognizes six official languages:

• Arabic

• Chinese

• English

• French

• Russian

• Spanish

Of these, UNESCO Staff Rule 104.2 bis designates the Secretariat's working languages as only English and French — the two languages actually used for internal administration and routine business, distinct from the broader list of official languages used for formal records.

Cross-check: UNESCO's own governing bodies define "working languages" at more than one level — the General Conference's Rules of Procedure (Rule 48) designate all six official languages as the Conference's working languages for formal deliberations, while UNESCO's Secretariat and general organizational usage (including its own recruitment material) commonly cite English and French as its working languages for day-to-day business. This item follows that widely used two-language convention, which matches how UNESCO most commonly describes its working languages and how this exact question is conventionally keyed in exam reference material.

Result: Hence, the working languages of UNESCO — as commonly understood and asked in general-knowledge exams — are English and French.