Rkb+ Mainichi Broadcasting Corporation (Rkb+ 毎日放送株式会社, RKB mainichi hoso kabushiki gaisha) (stylized as +rkb) is a broadcasting station in Fukuoka, Japan, and it is affiliated with Japan Radio Network (JRN), Japan News Network (JNN) and TBS Network. It is owned by Mainichi Broadcasting System, Mainichi Shimbun and the Aso Group.

The initials RKB stand for Radio Kyushu Broadcasting (ラジオ九州放送, rajio kyushu hoso), the station's former name.