Forties can mean:
- 1940s, the years 1940–1949
- 40s, the years 40-49 AD
- The years 40-49 of any century - see List of decades
- The years 40-49 within an individual's lifespan
- Long Forties, area in the North Sea
- The Forties shipping forecast area (roughly corresponding to the Long Forties)
- Forties oilfield in the North Sea
- Roaring Forties, strong westerly winds found in the Southern Hemisphere
- Forty-ounce or forty, a glass bottle that holds 40 fluid ounces of malt liquor or beer.