Stadlen is a surname. Notable people with the surname include:
Hedi Stadlen, Austrian Jewish philosopher, political activist, and musicologist, better known in Sri Lanka as Hedi Keuneman Lewis J. Stadlen, American stage and screen character actor Nicholas Stadlen, British former High Court judge, son of Hedi and Peter Peter Stadlen, Austrian composer, pianist, and musicologist Allen Swift, professional name of Ira Stadlen, American actor and writer