Boag may refer to:
- Boag's Brewery, an Australian brewery
- James Boag I (c. 1804–1890), founder and proprietor of the brewery
- James Boag II (1854–1919), proprietor of the brewery, son of James Boag I
- Wally Boag (1920-2011), American stage performer
- Erin Boag (born 1975), New Zealand ballroom dancer
- Keith Boag, Canadian television journalist
- Business Owners Advisory Group, Northbrook, IL (USA) financial advisors, as BOAG
- British Overseas Aid Group, the five biggest NGOs in the UK: ActionAid, Oxfam, CAFOD, Save the Children and Christian Aid.