Seiwa can refer to:

  • Emperor Seiwa, emperor of Japan
  • Seiwa, Mie, a district in Mie, Japan
  • Seiwa, Kumamoto, a village located in Kumamoto Prefecture, Japan
  • Seiwa College, in Nishinomiya, Hyōgo, Japan
  • Seiwa University, in Kisarazu, Chiba, Japan

See also