Dah may refer to:
Dahlia (UK /deɪliə/ or US /dɑːliə/) is a genus of bushy, tuberous, herbaceous perennial plants native to Mexico.
Dahomey Kingdom (/dəˈhoʊmi/) was an African kingdom (located in the area of the present-day country of Benin) that existed from about 1600 until 1894, when the last king, Behanzin, was defeated by the French, and the country was annexed into the French colonial empire.
The city of Dahlonega is the county seat of Lumpkin County, Georgia, United States. As of the 2010 census, the city had a population of 5,242.
Dahlgren guns were muzzle-loading naval artillery designed by Rear Admiral John A. Dahlgren USN (November 13, 1809 – July 12, 1870), mostly used in the period of the American Civil War.
Dahanu is a coastal town and a municipal council in Palghar district of Maharashtra state in Konkan division.
Dahabshiil (Somali: Dahabshiil, Arabic: دهب شيل) is an international funds transfer company headquartered in Dubai, United Arab Emirates.
Dahlia (March 25, 1970 – 6 April 2001) was an American-bred Thoroughbred racehorse and broodmare. She won major races in France, England, Ireland, Canada, and the United States.
One of the modern systems of plant taxonomy, the Dahlgren system was published by monocot specialist Rolf Dahlgren in 1975 and revised in 1977, and 1980. However, he is best known for his two treatises on monocotyledons in 1982 and revised in 1985. His wife Gertrud Dahlgren continued the work after his death.