Tonnis van der Heeg (29 March 1886 – 15 August 1958) was a Dutch trade unionist, politician, and resistance activist.
He joined the Social Democratic Workers' Party (SDAP), inspired by his colleague, Evert Kupers, and also Progress through Brotherhood, a tailors' trade union.
[1][2] In 1919, van der Heeg helped refound the International Clothing Workers' Federation, and in 1920, he became its general secretary.
[1] The Nazis occupied the Netherlands in 1940, and van der Heeg was fired from his union post, while in 1941, Hilversum council was dissolved.
Van der Heeg agreed that it should continue on a merged basis, as the General Union of Workers in Textile and Clothing Companies, and in 1945, he was elected as its president.