The word Dao or Dão may refer to:
- Tao (Chinese: "The Way"), a philosophical concept
- Taoism
- Dao (film), a film by Tsui Hark
- Dao (game), an abstract strategy game
- Dao (political) (Dào), historical political divisions in China translated as "circuits"
- Dao (sword), a type of Chinese backsword
- Dracontomelon dao, a species of tropical canopy tree known as dao in Filipino
- Vinho do Dão, a wine made in Portugal
- Yao people, a minority ethnic group of Vietnam
- Dao (surname) (Đào), a Vietnamese surname
- Dao (Dungeons & Dragons), a type of genie in the game Dungeons & Dragons
Places:
- Dao, Capiz, Philippines
- Dao County, in Yongzhou, Hunan, China
- Dão-Lafões, a region in Portugal
- Rio Dão, a river in Portugal
- Barangay Dau, a village in Mabalacat, Pampanga, Philippines
The acronym DAO or D.A.O. may refer to:
- D-amino acid oxidase, a peroxisomal enzyme
- Data access object, a design pattern used in object-oriented software engineering
- Jet Data Access Objects, a general programming interface for database access on Microsoft Windows systems
- De-asphalted oil, a crude oil refinery process stream
- Defence Acquisition Organisation, the former name of the Australian Defence Materiel Organisation
- Defense Attaché Office (see military attaché), the office for military matters at embassies
- Diamine oxidase, an enzyme involved in the metabolism of histamine.
- Disk-at-Once, a recording mode for optical discs
- Dominion Astrophysical Observatory in Saanich, British Columbia, Canada
- Double action only, a trigger mechanism for semi-automatic firearms
- Dragon Age: Origins, a video game developed by BioWare and published by Electronic Arts