Kido (surname)
Kido (written: 木戸 lit. "tree door" or "wooden door", or 城戸 lit. "castle door") is a Japanese surname. Notable people with the surname include:

 Kido Takayoshi (1833–1877), Japanese politician of the Meiji Government
 Akiyuki Kido (born 1975), Japanese ice dancer
 , Japanese singer better known as Junko Hirotani
 Kōichi Kido (1889–1977), minister of the Cabinet of Japan during World War II

Others
 Markis Kido (born 1984), Indonesian badminton player

Fictional characters:
 Joe Kido, character from the Digimon animated series
 Madoka Kido, character from the School Rumble manga series
 Saori Kido, (Sienna in the English versions) and Mitsumasa Kido (Alman) are characters from the Saint Seiya (Knights of the Zodiac) animated series
 Shinji Kido, main character in the Kamen Rider Ryuki tokusatsu series
 Tatsuhiko Kido, male protagonist of the manga Nozoki Ana
 Tsubomi Kido, female character from Kagerou Project
 Takeshi Kido, Chief Inspector of Kempeitai in TV series The Man in the High Castle 
 Yuuto Kido, male protagonist of the anime Inazuma Eleven