Cadi-Keuy FC is a defunct sports club of Istanbul, Ottoman Empire.

Cadi-Keuy FC was a club which was founded by Englishmen James Lafontaine and Horace Armitage in 1902.

[1] Its name is a foreign rendering of Kadıköy, its home ground, as the standard Turkish Latin alphabet did not yet exist at the time of the club's creation.

On Sunday 31 January 1909 Kadiköy reached the final of the Union Club Cup, the first football cup to be played in Ottoman Empire, at the Union Club field at Kadiköy.

Constantinople champions 1906 Temistol Moisiyadis, Yani Vasiliadis, James Lafontaine, Cinon Poliheroniadis, Todori, Anthony Darny, “Bobby” Fuat Hüsnü, Dick Lafontaine, Horace Armitage, Nicholas Darny, Yorgo Yerasimidis, Mihal Yerasimidis, Toto Stelyanidis.