Deleting an orb:
CircleCI does not support deleting an orb, as publicly released orbs are potentially dependencies for other CircleCI user’s builds. Orbs are SemVer 4 compliant, and each published version is immutable. Allowing for deletions would make users susceptible to unexpected loss of functionality.
We recommend un-listing an orb whenever possible
You can un-list Orbs from the public registry using the CircleCI CLI with the following command:
circleci orb unlist <namespace>/<orb> <true|false> [flags]
More information on un-listing orbs is available here: How can I make my orbs private?
Please upvote this feature request for the option to delete orbs.