Okinoumi Ayumi (born 29 July 1985 as Ayumi Fukuoka) is a sumo wrestler from Okinoshima, Shimane Prefecture, Japan. He joined professional sumo in 2005, reaching the top division in 2010. His highest rank has been maegashira 1. He wrestles for Hakkaku stable.

At school he attended local sumo clubs and took part in national competitions, but had no desire to take up sumo as a profession, instead wanting to go to sea and taking examinations to become a licensed mariner. However, he ended up dropping out of high school and was introduced by an acquaintance to Hakkaku-oyakata, the 61st Yokozuna Hokutoumi, who persuaded him to join his Hakkaku stable.

He began his professional career in January 2005, fighting under his family name of Fukuoka. He was promoted to the second highest jūryō division after taking the yusho or tournament championship in the makushita division in January 2009 with a perfect 7-0 record. He changed his shikona to Okinoumi, a reference to his birthplace of Okinoshima (a tiny and remote island in Western Japan) which had been suggested by his father. He became the first sekitori from the Oki Islands since 1960. Troubled by a shoulder injury, he was demoted from jūryō after two losing records, but after reverting back to the name Fukuoka he won immediate promotion back to jūryō in July 2009. Fighting as Okinoumi once again, in January 2010 he won promotion to the top makuuchi division, becoming the first wrestler from Shimane Prefecture to do so in 88 years. He came through with a kachi-koshi or winning record in his debut makuuchi tournament in March, winning his last three bouts to score 8-7. This saw him promoted to maegashira 10 for May.