Rikuo or Rikuō may refer to:
*
Mutsu Province (1868)
, officially called was an old province of Japan in the area of Iwate and Aomori prefecture. Nussbaum, Louis-Frédéric. (2005). "''Mutsu''" in .
It was also known as or . In the Meiji era, the province was cut down to cover only present-day ...
, also called , an old province of Japan
* , an old motorcycle manufacturing company in Japan
*
Rikuo (''Darkstalkers''), a fictional character from the video game series ''Darkstalkers''
*
Rikuo Nemoto (1926 –1999), Japanese baseball catcher and manager
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