Spaceport Kii is a commercial spaceport located in Kushimoto, Wakayama Prefecture in Japan. Japan's first private spaceport, it is operated by Space One, who are using it to launch their solid-fuel rocket KAIROS. Three launch attempts have been made on the site, on 13 March and 17 December 2025 and on 4 March 2026, which all ended up being a failure.