Kyäni (Greek: Κυανή meaning "blue") is a settlement in the municipality of Didymoteicho in the northern Evros regional unit, Greece. It is situated between farmlands in the plains on the right bank of the river Erythropotamos, at 40 m elevation. In 2001 its population was 557. It is 3 km northeast of Asvestades, 4 km southwest of Mani, and 10 km northwest of Didymoteicho.
During the Ottoman period, other than the Turks, Kyäni was inhabited mostly by Bulgarians. It was occupied by the Greeks at the end of World War I and it became a part of Greece. Its current population is mostly descendants of Greek refugees from Eastern Thrace and Muslims.