Hiroko Nakayama (中山博子), born April 17, 1977, in Fukuoka, Japan, was the first actress to play Rei Hino/Sailor Mars in the Sailor Moon musicals. The first show she performed in was the original 1993 Sailor Moon - Gaiden Dark Kingdom Fukkatsu Hen, and her last was the Sailor Moon Super Spring Festival in 1994.
- Hiroko's birthday falls on the same day of her character, Rei Hino.
- She was a member of Sakurakko Club.
- She has released a full-nude idol photobook.