P. P. Werlein was an American music publisher based in New Orleans, Louisiana. At some point, the German-born Philip P. Werlein headed the music department at the Female Seminary of Clinton, Mississippi. However, music publishing became his main business when he entered the field in 1842 in Vicksburg, Mississippi. In 1853, he moved operations to New Orleans, where he established a company called Ashbrand & Werlein at 93 Camp Street. The name changed to P. P. Werlein the following year. He listed his address variously as 3 and 5 Camp Street and 172 Canal Street (before the 1894 street address renumbering).