This study investigated sex-related morphometric variation in Penaeus monodon collected from the Sudanese Red Sea coast between October 2025 and February 2026. A total of 119 specimens were examined, and total length, body weight, abdomen length, dorsal–ventral length, cephalothorax length, and cephalothorax width were recorded. Linear measurements were taken in centimeters, while body weight was measured in grams using a digital balance. Total length ranged from 13.3 to 16.0 cm in males and from 14.2 to 19.0 cm in females, whereas body weight ranged from 17 to 38 g and 26 to 70.5 g in males and females, respectively. Abdomen length ranged from 4.0 to 6.0 cm, dorsal–ventral length from 1.2 to 2.6 cm, cephalothorax length from 3.0 to 6.6 cm, and cephalothorax width from 1.0 to 2.6 cm. The length–weight relationship showed strong positive correlations, with correlation coefficients of 0.945 for males and 0.970 for females. The corresponding regression equations were Log W = −2.046 + 2.663 Log L for males and Log W = −1.626 + 2.602 Log L for females. Females represented 56% of the sampled population and generally exhibited greater total length, body weight, and abdomen length than males. The findings demonstrate pronounced sexual dimorphism in P. monodon from the Sudanese Red Sea coast and provide baseline morphometric information for further biological and fisheries-related studies of this species.