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The First Grammatical Treatise (Icelandic: Fyrsta málfræðiritgerðin [ˈfɪ(r̥)sta ˈmauːlˌfraiːðɪˌrɪːtˌcɛrðɪn]) is a 12th-century work on the phonology of the Old Norse or Old Icelandic language. It was given this name because it is the first of four grammatical works bound in the Icelandic manuscript Codex Wormianus. The anonymous author is today often referred to as the "First Grammarian".