Other
- Hartley, a unit of information—see ban (information)
- 103P/Hartley, a small periodic comet
- Hartley College, Point Pedro, Sri Lanka
- Hartley Film Foundation, a public foundation with a mission to cultivate, support and subdistribute documentary film, video and audio programs about world religions and spirituality
- Hartley's Potato Chips, makers of kettle cooked potato chips since 1935, Lewistown, Pennsylvania
- Hartley's, a UK jam and marmalade manufacturer
- Hartley oscillator, invented by Ralph Hartley
- USS Hartley (DE-1029), a Dealey class Destroyer Escort in the US Navy from 1957 to 1972
- Hartley's test, a statistical test used in ANOVA
- Hartley transform, an integral transform closely related to the Fourier transform
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