Yasunaga (written: 安永) is a Japanese surname. Notable people with the surname include:
- Hajime Yasunaga (安永 一?) (1901–1994), Japanese Go player
- Kōichirō Yasunaga (安永 航一郎, ?) (born 1962), Japanese manga artist
- Sotaro Yasunaga (安永 聡太郎?) (born 1976), Japanese footballer
- Tōru Yasunaga (安永 徹?) (born 1951), Japanese violinist
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