PD, P.D., or Pd may refer to:
The PDP-11 is a series of 16-bit minicomputers sold by Digital Equipment Corporation (DEC) from 1970 into the 1990s, one of a succession of products in the PDP series.
The PDP-10 is a mainframe computer family manufactured by Digital Equipment Corporation (DEC) from 1966 into the 1980s.
The PDP-8 was a 12-bit minicomputer produced by Digital Equipment Corporation (DEC). It was the first commercially successful minicomputer, with over 50,000 examples being sold over the model's lifetime.
The Partido Demokratiko Pilipino–Lakas ng Bayan (lit. Philippine Democratic Party–Power of the Nation), more commonly known as PDP–Laban, is the ruling political party in the Philippines.
The PDC World Darts Championship, known for sponsorship purposes as the William Hill World Darts Championship, organised by the Professional Darts Corporation (PDC), is one of the two World Professional Darts Championships held annually in the sport of darts.
PDCA (plan–do–check–act or plan–do–check–adjust) is an iterative four-step management method used in business for the control and continual improvement of processes and products.
The PDC European Tour is a series of darts tournaments held across Europe organized by the Professional Darts Corporation.