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 discontinued mainframe computer family manufactured by Digital Equipment Corporation (DEC) from 1966 into the 1980s.
The 12-bit PDP-8, produced by Digital Equipment Corporation (DEC), was the first successful commercial minicomputer.
The PDC 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.
The Partido Demokratiko Pilipino-Lakas ng Bayan (Philippine Democratic Party-Power of the Nation), more commonly known as PDP–Laban, is the ruling political party in the Philippines.
Petróleos de Venezuela, S.A. (PDVSA, Spanish pronunciation: [peðeˈβesa]) (Petroleum of Venezuela) is the Venezuelan state-owned oil and natural gas company.