Seiki Yoshioka, previously known as SEIKI, is a Japanese professional wrestler currently working for Pro Wrestling Noah, where he is a former GHC Junior Heavyweight Champion, and a member of the Stinger stable, led by Yoshinari Ogawa. Yoshioka is also known for his time in Wrestle-1, where he was a three-time Wrestle-1 Cruiser Division Champion, UWA World Trios Champion, and a one-time NWA International Lightweight Tag Team Champion.