The Shikoku Island League Plus (四国アイランドリーグplus, Shikoku Airando Rīgu purasu) is an independent professional baseball league on the island of Shikoku in Japan. (None of the teams in Nippon Professional Baseball are based in Shikoku.) The league currently has four teams, and has its league headquarters in Takamatsu. The Shikoku Island League Plus is part of the Japan Independent Baseball League Organization (which also includes the Route Inn Baseball Challenge League).