This study sought to identify Iranian preschool children's (N = 318) knowledge of genital and non-genital body parts. Assessment consisted of children naming selected external body parts in drawings of same-sex counterparts. Results indicated that almost all children knew the correct terms for their non-genital body parts, but few knew the correct terminology for their genitals. Many used slang terms and some appeared embarrassed or reluctant to reply (girls were more likely than boys not to respond). No statistically significant difference between the sex of children in knowledge of correct names of all genitals emerged. Boys knew the correct name of their genitalia (penis) significantly more than girls. Results indicated children are learning the names of their body parts but not their genitals, perhaps indicative of a lack of sexual health education that may be representative of the conservative culture in Iran. It is critical for young children to learn about their genitals as this knowledge provides the foundation for subsequent sex education and facilitates discussion about bodily safety to prevent sexual abuse. When children learn these names, it can facilitate disclosure of abuse and can assist those working with young children in medical settings, child protection and legal arenas.