Nathaniel Frederick Pfeffer (March 17, 1860 – April 10, 1932), nicknamed "Dandelion" and "Fritz", was an American baseball player. He was a second baseman in Major League Baseball between 1882 and 1897. His final game took place on June 14, 1897. During his career he played for the Troy Trojans (1882), Chicago White Stockings (1883–1889), Chicago Pirates (1890), Chicago Colts (1891, 1896–1897), Louisville Colonels (1892–1895) and New York Giants (1896).