Ridge density means the number of ridges present in a specified area of a fingerprint and several researches have been carried out on this aspect of fingerprints. This study was conducted with an aim to establish a relationship between sex and fingerprint ridge density. The fingerprints were taken from 100 subjects (50 males and 50 females) in the age group of 18-25 years. After taking fingerprints, the ridges were counted in the upper portion of the radial border of each print for all ten fingers and mean value was calculated. The results have shown that a the ridge density ranges from 7-16 ridges/25mm2 in male and 11-17 ridges/25mm2 in females. It has been successful to support the hypothesis that women tend to have a statistically significant greater ridge density than men