IID may refer to:

  • Interface Identifier, the last 64-bits of an IPv6 address
  • Internet identity, a social identity used by Internet users
  • Internet Identity, an Internet security company
  • Ignition interlock device, a breathalyzer connected to a vehicle's engine
  • Independent and identically distributed random variables in probability theory
  • Interaural intensity difference in determining the location of a sound
  • Internal Investigations Division (in law enforcement)
  • IRIX Interactive Desktop, software for interacting with a computer running the IRIX operating system
  • Iterative and Incremental Development in software development
  • A COM Interface ID
  • Invoke Image Display an Integrating the Healthcare Enterprise (IHE) Integration Profile
  • Imperial Irrigation District
  • Imperial Institute of Design, a design school in Monteswar, West Bengal, India

See also

  • 2D (disambiguation), including a list of topics named II-D, etc.