Georg Mancelius (Latvian: Georgs Mancelis, born 24 June / 4 July 1593 in Grenzhof (now Mežmuiža in Augstkalne Parish), Courland; died 17 March 1654 in Mitau) was a Baltic German Lutheran theologian in what is now Latvia. He wrote the first dictionary of the Latvian language. From 1635 to 1636 he was Vice Rector of the University of Tartu and from 1636 Rector.^[1]

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• 1619 - De terrae motu (earthquake of 30 June 1616 in Zemgale)
• 1631/1643 - Vademecum (guide to spiritual texts in Latvian)
• 1638 - Lettus, das ist Wortbuch sampt angehengtem täglichem Gebrauch der Lettischen Sprache. Riga, 1638 (long title: Lettus, Das ist Wortbuch, Sampt angehengtem täglichem Gebrauch der Lettischen Sprache; Allen vnd jeden Außheimischen, die in Churland, Semgallen vnd Lettischem Liefflande bleiben, vnd sich redlich nehren wollen, zu Nutze verfertigt durch GEORGIVM MANCELIVM Anno M. DC. XXXVIII)
• 1654 - Langgewünschte Lettische Postill (Latvian Sermon Book), reissued in 1699, 1746, 1769, 1823