You will have to remove the labels from all Issues:
https://confluence.atlassian.com/display/JIRAKB/How+to+Delete+Labels+in+JIRA
But if you do this by Bulk Editing, all other labels of the edited Issues will be removed.
A second way is to remove them directly in your DB, but this is just recommended if you really know what you are doing.
This might help:
https://answers.atlassian.com/questions/141323/is-it-possible-to-rename-a-label
I want to point-out that with a recent version of JIRA you can now remove a single label from issues using a bulk operation.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.
If you have a large number of labels, removing from each issue will be impossible.
For that use case, we have developed an app: Label Manager for Jira Cloud
It allows managing labels (searching, filtering, changing name, deleting etc.) from a single page. Try it out and let us know if you face any issues.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.
Online forums and learning are now in one easy-to-use experience.
By continuing, you accept the updated Community Terms of Use and acknowledge the Privacy Policy. Your public name, photo, and achievements may be publicly visible and available in search engines.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.