Majalisar Konstantinoful ta farko wata majalisa ce ta mabiya addinin kirista da aka yi a Constantinople (yanzu Istanbul, Turkiyya) a shekara ta 381 AD. Kalmar “ecumenical” na nufin cewa taron bishop ne daga ko’ina cikin duniyar Kirista, kuma manufarta ita ce. don kafa koyaswar orthodox da warware takaddamar tauhidi a cikin Cocin Kirista na farko. An san majalisar don tabbatar da Allahntakar Ruhu Mai Tsarki, da kuma bitar koyarwa ta Nicene, wadda har yanzu ake karantawa a yawancin majami'un Kirista a yau.