Harry Marston Haldeman (5 April 1871 – 10 March 1930) was a significant business and social contact of L. Frank Baum. Originally from Chicago like Baum, Haldeman was an owner and executive of plumbing companies in Los Angeles. Marston founded the Uplifters, the Los Angeles social club that was an important influence in Baum's life during his years in California. Baum composed the lyrics for the club's official song, which was titled "Haldeman."