Keff may refer to:
- an abbreviation for the reactivity coefficient k-effective (written as keff), the effective neutron multiplication factor within an assembly of fissile material, in nuclear reactor theory
- Kerala Farmers Federation, an Indian organisation
- Keff McCulloch, a British composer
- Keff Ratcliffe, a Welsh musician and the former guitarist for the American band LA Guns.
This disambiguation page lists articles associated with the title Keff.
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