The capture of the crabs of the genus Callinectes is one of the income generating activities of the waterside communities of Benin. The present paper aimed to provide basic information on the reproductive parameters of the main crab species of this genus in Benin’s lagoons. The crabs were collected from february 2017 to january 2018. The sex-ratio of Callinectes amnicola is not different from the theoretical rate of 1 male for 1 female (p>0.05) in contrary to Callinectes pallidus (p<0.05). The first maturity size of Callinectes amnicola males is 11.87 cm (East Complex) and 10.78 cm (West Complex), respectively. For females, the size of first maturity is 10.07 cm (East Complex) and 11.20 cm (West Complex). The first maturity size of Callinectes pallidus male is 9.99 cm (East Complex) and 9.17 cm (West Complex). Callinectes pallidus female are mature at 7.68 cm (East Complex) and 6.45 cm (West Complex). Breeding of both species occurred at Lake Nokoue in areas near the Atlantic Ocean from february to may. The ovigerous females of Callinectes amnicola with carapace width greater than 9.5 cm are more productive than those of lower widths. All collected ovigerous Callinectes pallidus females show good reproductive productivity.