You would need an add-on for this, since bulk user delete isn't supported in Jira yet:
The downside is that your version is quite old and no longer supported, so many of those add-ons may not work with your version.
You can give Bob Swift's Jira Command Line Interface a try, with the removeUser action. You can use runFromSql to do it in bulk. Please do keep in mind that it's only rated to work with Jira Server 7.1.0 - 7.5.3, so you may end up having to delete the users individually.
Let me know if you have any questions.
Hey Community mates! Claire here from the Software Product Marketing team. We all know software development changes rapidly, and it's often tough to keep up. But from our research, we've found the h...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs