Seishirō

• Seishiro Endo, Japanese aikidoka
• Seishiro Etō, Japanese politician
• Seishirō Itagaki, Japanese general
• Seishiro Kato, Japanese child actor
• Seishirō Nishida, Japanese actor
• Seishiro Okazaki, Japanese American jujutsuka
• Seishirō Sakamoto, Japanese baseball player
• Seishiro Shimatani, Japanese footballer

  Fictional characters

• Seishirō Sakurazuka, a character in the manga series Tokyo Babylon