Acadia (in the French language l'Acadie) was the name given to a colonial territory in northeastern North America that included parts of eastern Quebec, the Maritime provinces, and modern-day New England, stretching as far south as Philadelphia. The actual specification by the French government for the territory refers to lands bordering the Atlantic coast, roughly between the 40th and 46th parallels. Later, the territory was divided into the British colonies which were to become Canadian provinces and American states.

The Association for Computer Aided Design In Architecture (ACADIA) is a non-profit organization active in the area of computer-aided architectural design (CAAD).