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"Now thank we all our God" is a popular Christian hymn. It is a translation from the German "Nun danket alle Gott", written circa 1636 by Martin Rinkart (1586-1649), which in turn was inspired by Sirach, chapter 50 verses 22-24, from the praises of Simon the high priest. It was translated into English in the 19th Century by Catherine Winkworth.
The Late-Romantic German composer Sigfrid Karg-Elert was one of the more recent composers to use this hymn, composing a 'Marche Triomphale' which is a famous piece in the classical pipe organ repertoire.