Explanation
Yes. English and French are the working languages of the United Nations Secretariat, used for its day-to-day professional exchanges.
The United Nations Office at Geneva states this distinction in both its multilingualism overview and its language FAQ. It separately lists Arabic, Chinese, English, French, Russian and Spanish as the UN's six official languages.
Official languages of the organization and working languages of a particular body are different categories. The Secretariat's arrangement should not be generalized to every UN body or interpreted as meaning that the UN has only two official languages.
Key takeaway
The UN has six official languages, while English and French are the Secretariat's working languages.