Yuko Arimori (有森 裕子, Arimori Yūko, born December 17, 1966, in Okayama) is a Japanese professional marathon runner and a Goodwill Ambassador for the United Nations Population Fund (UNFPA).

Arimori competed for Japan in the 1992 Summer Olympics held in Barcelona, Spain in the marathon where she won the silver medal with a time of 2:32:49, eight seconds behind Russian Valentina Yegorova who ran the race in 2:32:41.

Arimori was the first woman granted professional status by the Japanese Amateur Athletic Federation (JAAF), the nation's governing track and field association.

[2] She married Gabriel Wilson in January 1998 in Boulder, Colorado, United States.

They separated one month after their marriage, and Wilson revealed his extensive debts and previous homosexual tendencies, admitting "I was gay", at a press conference.