Andreas Crappius, also Krapp, Crappe (* 1542 in Lüneburg; † January 8, 1623 in Hannover) was a German music teacher and church song composer. He enrolled at the University of Wittenberg in 1565 (director: his uncle Philipp Melanchton) but left it in 1567 without an academic degree. From March 28, 1568 until 1616 he occupied the position of cantor at the Latin School in Hannover which was linked to the cantorate of the Marktkirche. His textbook "Musicae artis elementa", published in 1599 remained in use for a long time. As a composer Crappius ensured that the style of the Reformation years was preserved in Protestant church music. Besides choral and church music he also wrote three masses. With his activities as a composer, choirmaster and teacher, he had a decisive influence on Hanoverian musical life, gained prestige and retired in 1616.