DHA may refer to:

• docosahexaenoic acid, an omega-3 essential fatty acid.
• dihydroxyacetone, a colorless chemical (derived from glycerin) that interacts with the amino acids in dead skin cells to produce a brown color change. It is the active ingredient in sunless or self-tanning skincare products.
• the United Nations Department of Humanitarian Affairs, now known as the Office for the Coordination of Humanitarian Affairs
• Defence Housing Authority, a provider of family housing for members of the Australian Defence Force
• Defence Housing Authority, a large suburb of Karachi providing commercial and residential housing for the army of Pakistan.
• Directory Harvest Attack, a method to learn valid email addresses used by spammers.
• Doctor of Health Adminstration, professional doctoral degree
• Dha (sword), a single-edged weapon found in Burma/Myanmar, Thailand, and other parts of Southeast Asia.

DHA