The Jan Tinbergen Outgoing Correspondence dataset consists of letters which started in the mid 1920’s and lasted right up to his decease in 1994, Jan Tinbergen corresponded with hundreds of people about a myriad of topics related to his work as lecturer and researcher of the Erasmus University, as economic advisor of the League of Nations in Geneva (1936-38), as first director of the Central Planning Bureau of the Netherlands (1945-1955), as advisor of The Club of Rome, and after his final retirement from academia in 1975, as engaged citizen in matters such as world peace, environmental pollution and North-South inequality.