Ariana Mamiko Miyamoto (宮本・エリアナ・磨美子, Miyamoto Eriana Mamiko, born 12 May 1994) is a Japanese model and beauty pageant titleholder who was crowned Miss Universe Japan 2015. She represented Japan at the Miss Universe 2015 pageant and was placed Top 10.
Miyamoto was born to a Japanese mother and African American father, Bryant Stanfield, who was stationed at a United States Navy base in Sasebo. Miyamoto's parents divorced when she was one year old. She attended elementary school in Japan and, at age 13, immigrated to the United States to live with her father in Jacksonville, Arkansas, where she attended Jacksonville High School for two years. Upon return to her native Japan, she did not immediately complete high school, but worked odd jobs, including bartender.
In 2015, Miyamoto won the title of Miss Nagasaki and represented her prefecture at the Miss Universe Japan contest.