Beidler is a surname. Notable people with the surname include:
Francis Beidler (1854–1924), Chicago-based lumberman Isolde Beidler (1865–1919), first child of the composer Richard Wagner Jacob A. Beidler (1852–1912), American politician Joe Beidler (1918–2016), American baseball player John X. Beidler, or simply "X. Beidler", associated with the Montana Vigilantes Philip Beidler (1944–2022), American professor of American literature, author, and editor