This paper describes the side difference and sexual dimorphism of the radius in the human skeletal remains from the Himrin Basin, Iraq, and presents a discriminant function for sex determination of Iraqis based on radial measurements. One hundred and eight bones were examined for this purpose using a total of 15 height, width, depth, and girth measurements and indices. All the 15 measurements exhibited insignificant side differences of the radius, while 13 of the original 15 measurements revealed significant sex differences of the radius. A discriminant function for sex determination of the radius was obtained using multivariate techniques. Although the function had high theoretical ratio (95.7%) and observed ratio (95.2% of the 63 cases) of correct diagnoses of sex, it could not be put to the final test owing to the insufficient number of samples. We therefore proposed the function that decreased the incorrect diagnosis rate to the minimum (1%) by setting the doubtful region for reserving sex determination.