Geertruida Catharina Theresia Maria "Truus" Smulders-Beliën (née Beliën; 20 November 1902 – 11 June 1966) was a Dutch politician and teacher who was the mayor of Oost-, West- en Middelbeers in North Brabant from 1946 to 1966.

The first female mayor in the Netherlands, she succeeded her husband Jan Smulders [nl] after he was executed by Nazi soldiers.

[3][4] After she learned of Jan's death, Truus applied for the position of mayor, writing letters of interest to Minister of the Interior Louis Beel, Queen's Commissioner Johannes Theodorus Maria Smits van Oyen [nl], and Queen Wilhelmina.

[6] She was re-appointed as mayor in 1952, 1958, and 1964, and was a Catholic People's Party member of the Provincial Council of North Brabant beginning in 1950.

[7] In 1966, Smulders-Beliën was admitted to the Groot Ziekengasthuis [nl] hospital in 's-Hertogenbosch due to surgical complications from a cervical cancer operation.