Mathias Peter Møller, commonly known as M.P. Möller or Moeller (29 September 1854 – 13 April 1937), was a prolific pipe-organ builder and businessman. A native of the Danish island of Bornholm, he emigrated to the United States in 1872 and founded the M.P. Moller Pipe Organ Company in Greencastle, Pennsylvania, in 1875. The city of Hagerstown, Maryland, took notice of Möller's early successes and induced him to move his business there in 1881 to help make it a viable business center in Western Maryland. The company remained in business in Hagerstown. until 1992, with hundreds of employees at its peak and a lifetime production of over 12,000 instruments.