Fujiko Fujio (藤子 不二雄) was a manga writing duo formed by Japanese manga artists Hiroshi Fujimoto (藤本 弘, Fujimoto Hiroshi; December 1, 1933 – September 23, 1996) and Motoo Abiko (安孫子 素雄, Abiko Motoo; March 10, 1934 – April 6, 2022). They debuted in 1951 as a duo under their real names. The Fujiko Fujio name was used for their respective works from 1953 until 1987, when Fujimoto became too ill to work consistently.

The pair was best known for their popular children's manga series, including Obake no Q-Tarō, Ninja Hattori-kun, Kaibutsu-kun, Perman, Kiteretsu Daihyakka and Doraemon. Some of their influences include Osamu Tezuka as well as international cartoons and comic books. Both artists base their writing style on a mix of morals with a subversive and wry sense of humor; their styles would evolve to the point of diversion, where Fujimoto focused on speculative science fiction in addition to children's works, while Abiko leaned towards the surreal and black comedy.

Their work received critical acclaim and, on Fujimoto's part, universal recognition, with Doraemon being officially recognized as a cultural icon of modern Japan.

For many years after their debut, they collaborated and wrote individually under one pen name. However, after 1988, they published under separate names.

From July 1953 to around January 1988, the two published both collaborations and individual works under one pen name, Fujiko Fujio (藤子 不二雄).

Fujimoto used the pen name Fujiko F. Fujio, officially written Fujiko・F・Fujio (藤子・F・不二雄, Fujiko Efu Fujio), from 1989 until his death.

Abiko used the pen name Fujiko Fujio A, officially written Fujiko Fujio Ⓐ (藤子不二雄Ⓐ, Fujiko Fujio Ē), from 1988 until his death.

It is commonly misspelled "Fujiko A. Fujio"; Abiko never used this spelling.