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Genpuku (?) or genbuku was an historical Japanese coming-of-age ceremony. The etymology is atypical; in this case gen (元) means "head" and fuku (服) means "wearing". The ceremony is also known as kakan (加冠), uikōburi (初冠), kanrei (冠礼), shufuku (首服), and hatsu-motoyui (初元結).

To mark the entry to adult life of boys between the ages of 11 and 17 (typically of about age 12), they were taken to the shrines of their patron kami. There they were presented with their first adult clothes, and their boys' hairstyles (角髪 mizura?) were changed to the adult style. They were also given new adult names (烏帽子名 eboshi-na) or Courtesy Name (字 Azana).

In Heian times, the ceremony was restricted to the sons of noble and samurai families. During the Muromachi era, it gradually spread to include men of lower ranks.

The equivalent ceremony for women was called mogi (裳着?); this was performed for girls aged between 12 and 14, and was similarly based around the presentation of adult clothing.