AD

AD or ad may stand for:

• ad or advertisement, see advertising
• ad- prefix
• Andorra, ISO country code
• anno
  • anno Domini ("[in the] year of [Our] Lord"). This year is A.D. . Synonym: "CE" (Common Era).
  • anno Diocletiani, the original meaning, see Roman calendar#Years
• the US Navy hull classification symbol for Destroyer Tender