Mizuho Katayama (born 27 November 1969) is a synchronized swimming coach in Japan.
Born to a Korean family in Japan, she participated in Japanese domestic synchronized swimming competitions under the name Mizuho Kochi, and represented South Korea in international competitions under the name Kim Mijinsu, most notably in the women's solo and women's duet competitions at the 1988 Summer Olympics.
After her retirement from the South Korean national team, she married and began using her current name.