This paper intends to determine whether there is a relation between the external public debt and the economic growth in the Republic of the Congo 1975-2015. To achieve the purpose, we have applied a model of multiple regression. Therefore, the results demonstrate that the external public debt and the debt service had a negative effect on growth. Hence, the study recommends to the Congo to comply with convergence criteria of EMCCAS which set the threshold of the public debt by 70 % of GDP.