Katsuki (written: 香月 or 勝生) is a Japanese surname. Notable people with the surname include:
- Kiyoshi Katsuki (香月 清司, 1881–1950), Japanese general
- Masako Katsuki (勝生 真沙子), Japanese voice actress
- Ryoji Katsuki (香月 良仁, born 1984), Japanese baseball player
- Ryota Katsuki (香月 良太, born 1982), Japanese baseball player
Fictional characters:
- Tsubasa Katsuki (勝木 翼), a character in the manga series Comic Girls
- Yuri Katsuki (勝生 勇利), protagonist of the anime series Yuri on Ice
- Katsuki Bakugo (爆豪 勝己), a character in the manga series My Hero Academia
Katsuki (written: 勝己, 勝記, 克己, 克紀, 克貴 or 克樹) is also a masculine Japanese given name. Notable people with the name include:
- Katsuki Akagawa (赤川 克紀, born 1990), Japanese baseball player
- Katsuki Hagiwara (萩原 克己, born 1949), Japanese music critic
- Katsuki Ishihara (石原 勝記, born 1939), Japanese swimmer
- Katsuki Matayoshi (又吉 克樹, born 1990), Japanese baseball player
- Katsuki Umezu (梅津 克貴, born 1999), Japanese footballer
- Katsuki Yamazaki (山崎 勝己, born 1982), Japanese baseball player
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