Other
- Hardiness (plants), the ability to survive adverse growing conditions
- The Hardy Boys, a detective series
- Hardy Boyz, a wrestling team composed of Matt Hardy and Jeff Hardy
- Hardy class destroyer
- Hardy Cup, Canadian ice-hockey trophy
- Hardy fish
- Hardy hole in an anvil
- Hardy's inequality in mathematics
- Hardy–Littlewood circle method in mathematics
- Hardy notation in mathematics
- Hardy Oil and Gas, British company
- Hardy's theorem in mathematics
- Hardy palms
- Hardy's Pygmy Owl
- Hardy's skink
- Hardy space
- Hardy tool, metalworking tools used in conjunction with an anvil
- Hardy–Weinberg principle in genetics
- The Hardy Wine Company, an Australian wine company
- Hardy Heron, the codename for the 8.04 (April 2008) release of Ubuntu Linux
- Hardy vacuum brake on locomotives
- HMS Hardy (ship), can refer to:
- HMS Hardy (1895)
- HMS Hardy (1936)
- HMS Hardy (F54)
- 2866 Hardy, asteroid
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