"Dao" may refer to:

• The Chinese character 道 (Pinyin: dào; Wade-Giles: tao⁴), which may refer to:
  • a philosophical concept in Taoism
  • circuits, a historical political division once used in China

(See more at Do.)

• The Dao , a minority ethnic group of Vietnam.
• The single edged Dao (sword) used in China.
• Short for Data Access Object, an object which is responsible for encapsulating data source access from the logic of a business object.