《信徒精兵歌》，或依歌词首句称为《信徒如同精兵》，为一首19世纪的英国基督教赞美诗。该诗的词为萨宾·巴林古尔德作于1865年，曲为亚瑟·沙利文作于1871年。此曲创作于他朋友的乡间房舍中，沙利文将此曲以朋友妻子的名字“St. Gertrude”命名。后救世军常用此曲作为游行时所用的赞美诗。该曲也成为了沙利文最著名的赞美诗之一。其主题来自于新约圣经中提到的基督徒作为耶稣精兵的说法，例如提摩太后书2:3中：“你要和我同受苦难，好像基督耶稣的精兵”。

冯玉祥曾以此诗歌作为其军队的军歌。上海交通大学和雅礼中学的校歌，以及国立**大学幼稚园园歌采用本诗歌的曲调。

"Onward, Christian Soldiers" is a 19th-century English hymn. The words were written by Sabine Baring-Gould in 1865, and the music was composed by Arthur Sullivan in 1871. Sullivan named the tune "St. Gertrude," after the wife of his friend Ernest Clay Ker Seymer, at whose country home he composed the tune. The Salvation Army adopted the hymn as its favoured processional. The piece became Sullivan's most popular hymn. The hymn's theme is taken from references in the New Testament to the Christian being a soldier for Christ, for example II Timothy 2:3 (KJV): "Thou therefore endure hardness, as a good soldier of Jesus Christ."