Kazumasa (written: 数正, 和正, 和昌, 和政, 一眞, 一正, 一将, 一存, 一政 or 員昌) is a masculine Japanese given name. Notable people with the name include:
*, Japanese baseball player
*, Japanese musician
*, Japanese writer
*, Japanese weightlifter
*, Japanese samurai
*, Japanese samurai
*, Japanese samurai
*, Japanese footballer
*, Japanese baseball player
*, Japanese singer-songwriter and composer
*, Japanese photographer
*, Japanese badminton player
*, Japanese ice hockey player
*, Japanese ''daimyō''
*, Japanese footballer
*, Japanese samurai
*, Japanese footballer
*, Japanese boxer
*, Japanese footballer
*, Japanese baseball player
{{given name
Japanese masculine given names