Kōki, Koki, or Kouki is a masculine Japanese given name. Notable people with the name include:
Koki, one of the main characters in Wild Kratts
Koki Ando, president of Nissin Food Products Co. Ltd
Kōki Harasawa (born 1971), Japanese voice actor
Kōki Hirota (1878–1948), Japanese diplomat
Koki Ishii (1940–2002), Japanese politician
Kōki Kameda (born 1986), Japanese professional flyweight boxer
Koki Kotegawa (born 1989), Japanese footballer
Kōki Mitani (born 1961)
Kōki Miyata (born 1972), Japanese voice actor
Koki Mizuno (born 1985), Japanese footballer
Koki Sakamoto (born 1986), Japanese Gymnast in the 2008 Olympics
Kouki Takahashi (1987–2011), Japanese motorcycle racer
Koki Yonekura (born 1988), Japanese footballer
Koki Tanaka (born 1985), member of a Japanese group KAT-TUN