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Puberty has different factors affecting its onset e.g. race, nutrition, hormonal stimulation. The aim of this research is to investigate the racial differences in onset of puberty among Saudi and non-Saudi young females living in the same environment. This cross-sectional study includes 568 healthy young females aged between 6-14 years living in Jeddah. In the present study, 60.7% of females were Saudis and 38.2% were non-Saudis. There were no significant differences found between each of the age of breasts development (p=0.187), age of first appearance of pubic hair (p=0.308), and the age of menarche (p=0.651) among Saudi and non-Saudi young females living in Jeddah. There were no significant differences between pubertal developmental age among Saudi and non-Saudi young females living in Jeddah.