(瑛九 Eikyū, April 28, 1911 – March 10, 1960, in English occasionally "Q. Ei" or "Ei Kyu") was a Japanese artist who worked in a variety of media, including photography and engraving.
Ei-Q was influenced by the Surrealist aesthetic and also published essays promoting photography as an art form independent of painting.
Ei-Q set up the art organization Jiyū Bijutsu Kyōkai (自由美術協会) in 1937; this lasted until 1951.
Ei-Q was able to resume his work after the war and in 1951 set up the group Democratic Artists Association (デモクラート美術家協会, Demokurāto Bijutsuka Kyōkai) in Osaka. Membership was by invitation only, but the idea was to promote the free expression of members, who included woodblock artists, designers, photographers and others.
On Ei-Q's move from Osaka to Urawa later in the same year, the group set up a branch in nearby Tokyo as well; Eikoh Hosoe and Takeji Iwamiya then joined. The Association lasted until 1957, holding exhibitions of its works.
Ei-Q was also active in art education, in 1952 setting up Sōzō Biiku Kyōkai (創造美育協会).