PWM may refer to:

  • PWM (window manager), an X window manager
  • Panzerwurfmine, a type of fin-stabilised shaped charge anti-tank hand grenade used by German Luftwaffe ground troops in World War II
  • Position weight matrix or position-specific scoring matrix, a representation in motifs in biological sequences
  • Portland International Jetport, an airport in Portland, Maine, U.S.
  • Professional Wealth Management, a financial magazine
  • Pulse-width modulation, an efficient way of providing intermediate amounts of electrical power
  • Permanent Way Machine, the British Rail Class 97/6 locomotives
  • Polskie Wydawnictwo Muzyczne, a music publisher, Poland