Miki (written: 三木 lit. "three trees") is a Japanese surname. Notable people with the surname include:

• Honoka Miki (born 1997), Japanese actress
• Minoru Miki (1930–2011), Japanese composer and artistic director
• Mutsuko Miki (1917–2012), Japanese activist who advocated on behalf of pacifism, official compensation for comfort women, and improved Japan–North Korea relations, wife of Japanese Prime Minister Takeo Miki
• Shinichiro Miki (born 1968), Japanese voice actor
• Shunsuke Miki (三木 俊介, born 1944), Japanese rower
• Tsubaki Miki (born 2003), Japanese snowboarder
• Takeo Miki (1907–1988), 66th Prime Minister of Japan
• Taku Miki (1935–2023), writer
• Yoshio Miki (三木 義雄, 1905–?), Japanese hurdler

Fictional characters

• Sayaka Miki, a character in the anime series Puella Magi Madoka Magica