Limited Data have been found on the reproductive biology of Charybdis hellerii (A. Milne-Edwards, 1867) in Indonesia. To fill this gap, the current study aimed to analyze various aspects of the reproductive biology of C. helleri, male and female, in Lasongko and Kendari Bays. Using traps, samples of crab species were monthly collected (from March- November 2019) with the help of blue swimming crab fishermen. Results showed that the total sex ratio of C. hellerii in Lasongko and Kendari Bays were 1: 0.48 and  1: 0.57, respectively. However, the temporally sex ratio of the crabs varied.  In Lasongko Bay, male gonads of C. hellerii were majorly immature, while those of the females and ovigerous females were mature. Meanwhile, in Kendari Bay, all three types were predominantly immature, and they were all temporally varied. The first sizes sexual maturity of the male and female C. hellerii in Lasongko Bay were 60.04 mmCW and 53.12 mmCW, respectively, while those of Kendari Bay were 60.23 mm CW and 53.24 mmCW, respectively. The spawning season of this crab species tends to occur throughout the year. Therefore, the data obtained in this study can be used for the management of C. hellerii in Lasongko and Kendari Bays and Southeast Sulawesi waters.