Petrus Josephus Servatius (Jos) Serrarens (12 November 1888 – 26 August 1963) was a Dutch politician and judge.

[2] At the end of that year he was introduced to Catholic socialist movement Katholieke Sociale Actie, Serrarens joined the organization as a librarian.

Serrarens was the negotiator between Belgian, German and French parties wishing to construct an internationally operating Roman Catholic labour union.

His efforts were successful and Serrarens became Secretary General of the International Federation of Christian Trade Unions (IFCTU).

When Germany invaded the Netherlands in 1940 the secretariat of the IFCTU was raided, Serrarens had however moved the most important documents of the organization to neutral Geneva, Switzerland in advance.