Italian is not one of the six official languages of the United Nations.

There are six official languages of the UN. These are Arabic, Chinese, English, French, Russian, and Spanish.

Arabic:

• official and working language of the General Assembly (18 Dec. 1973)

• official language of the Economic and Social Council (15 April 1982)

• official and working language of the Security Council (21 Dec. 1982)

Chinese:

• official language of the United Nations (except the International Court of Justice, ICJ) (1 Feb. 1946) and of the Security Council (24 June 1946)

• working language of the General Assembly (18 Dec. 1973)

• working language of the Security Council (17 Jan. 1974)

English:

• official and working language of the United Nations (except the ICJ) (1 Feb. 1946) and of Security Council (24 June 1946)

French:

• official and working language of the United Nations (except the ICJ) (1 Feb. 1946) and of the Security Council (24 June 1946)

Russian:

• official language of the United Nations (except the ICJ) (1 Feb. 1946) and of the Security Council (24 June 1946)

• working language of the General Assembly (21 Dec. 1968)

• working language of the Security Council (22 Jan. 1969)

Spanish:

• official language of the United Nations (except the ICJ) (1 Feb. 1946) and of the Security Council (24 June 1946)

• working language of the General Assembly (7 Dec. 1948)

• working language of the Security Council (22 Jan. 1969)

More Info: en.wikipedia.org