AHD or Ahd may refer to:
Linguistics Althochdeutsch (Ahd.), the German name for Old High German The American Heritage Dictionary of the English Language
Science and technology Acoustic hailing device, a high-powered loudspeaker for communicating at long distances Alveolar hydatid disease, a parasitic disease Analog High Definition, a standard for transmitting high-definition analog video Arteriosclerotic heart disease, a buildup of plaque in arteries leading to the heart Audio High Density, a digital disc format
Other uses Ahd Party, a Jordanian political party Ardmore Downtown Executive Airport, Oklahoma, US (IATA code AHD) Ashtead railway station, Surrey, England, station code Australian Height Datum, a standard for measuring heights An Hoi Dong, a ward in Ho Chi Minh City