John Kladas (Greek: Ιωάννης Κλαδάς) was a Byzantine hymnographer who lived in the late 14th and early 15th centuries. He had the post of lampadarius in the cathedral of Hagia Sophia of Constantinople. He is considered the third most important Byzantine hymnographer after John of Damascus and John Kukuzelis. He wrote several works on the theory of music, the most important being the Grammatike tes mousikes (The Grammar of Music). His daughter was a chanter and hymnographer, known only from one c
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