Repasamos brevemente la historia y logros del Departamento de Física Teorica (DFT) del ICIMAF desde su fundacion en 1976. Los datos y opiniones de miembros previos y actuales del DFT fueron tomados de una serie de entrevistas realizadas a los participantes de la conferencia científica FT-45, realizada virtualmente en marzo de 2021, para celebrar el 45 aniversario del DFT. We briefly review the history and achievements of the Department of Theoretical Physics (DFT) of the ICIMAF since its foundation in 1976. The data and opinions of former and current members of the DFT were taken from a series of interviews made to the participants of the scientific conference FT-45, held virtually in March 2021, to celebrate the 45th anniversary of the DFT.