Omer Liévin Benjamin Becu (21 August 1902 – 9 October 1982) was a Belgian trade unionist, who became General Secretary of the International Confederation of Free Trade Unions. Born in Ostend, Becu trained as a radio operator and joined the merchant navy. He soon became involved in trade unionism, and in 1929 became the full-time assistant general secretary of the International Mercantile Marine Officers' Association. In 1932, he was elected as the union's general secretary, simultaneously becoming general secretary of the Belgian Union of Merchant Marine Officers. In this role, he gave support to the republicans in the Spanish Civil War.