The Union of Bookworkers of Belgium (French: Centrale des travailleurs du livre de Belgique; Dutch: Centrale der Boekbewerkers van België, CBB) was a trade union representing printers and bookbinders in Belgium.
After World War I, the unions affiliated to the Trade Union Commission (SK) were increasingly able to achieve agreements which covered the entire printing industry.
The SK persuaded the Central Union of Bookbinders and the Union of Lithographers to merge in 1924, although the Belgian Typographical Federation (FTB) refused to join.
In 1937, it transferred from the SK to its successor, the General Labour Confederation of Belgium.
During the Nazi occupation, it affiliated to the collaborationist Union of Manual and Spiritual Workers, but suffered the loss of most of its members.