"Baldy" Louden (August 27, 1883 – December 8, 1935), known as Bill Louden, was an American baseball player.
He played professional baseball from 1906 to 1920, including six years in Major League Baseball as an infielder with the New York Highlanders (1907), Detroit Tigers (1912–1913), Buffalo Buffeds (1914–1915), and Cincinnati Reds (1916).
He appeared in 603 major league games (313 at second base, 176 at shortstop) and compiled a .261 batting average and a .355 on-base percentage.