Guinness is a surname of Irish origin. Guinness (drink) is also a famous Irish brand of beer.
It may also refer to:
Businesses
- Guinness Brewery, Dublin, Ireland
- Guinness Mahon, a merchant bank
- Guinness Peat Aviation, an aircraft leasing company
- Guinness Peat Group, an investment holding company
People
- Guinness (surname)
- Guinness family, descendants of Arthur Guinness and his brother Samuel Guinness
Sports
- Guinness GAA, a former Gaelic Athletic Association club
- Guinness Premiership, a rugby union competition, sponsored by Guinness between 2005 and 2010
Other uses
- Guinness World Records, a reference book
- Guinness baronets, titles
- The Guinness Partnership, a housing association and charity