Red hat

Red hat or Red Hat may refer to:

* Red Hat, Inc. a company dedicated to open source software such as Linux
* Red Hat Linux, a former product of Red Hat, Inc., now replaced by Red Hat Enterprise Linux
* Red Hat sect, a classification of schools of Tibetan Buddhism
* Red Hat Society, a woman's social organization
* Galero, a red hat historically bestowed upon Catholic cardinals
* A representation of a thinking strategy in Edward De Bono's Six Thinking Hats
* A slang term for a member of the Military Police in the Canadian Forces, referring to their distinctive red berets
*A term for a firefighter-in-training (recruit) in many U.S. fire departments or volunteer fire departments, referring to the color of the training helmet