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Red Hat Enterprise Linux is a Linux distribution produced by Red Hat and targeted toward the commercial market, including mainframes. Red Hat commits to supporting each version of Red Hat Enterprise Linux for 7 years after its release. All of Red Hat's official support, all of Red Hat's training and the Red Hat Certification Program center on the Red Hat Enterprise Linux platform. Red Hat Enterprise Linux is often abbreviated to RHEL, but Red Hat is now attempting to discourage this.

New versions of Red Hat Enterprise Linux are released every 18 to 24 months. When Red Hat releases a new version of Red Hat Enterprise Linux, customers may upgrade to the new version at no additional charge as long as they are in possession of a current subscription (i.e. the subscription term has not yet lapsed).

Verbatim copying and redistribution of the entire Red Hat Enterprise Linux distribution is not permitted due to trademark restrictions. However, there are several redistributions of Red Hat Enterprise Linux minus trademarked features (such as logos and the name).