When you create your workspace, you assign it a name and a URL. This is obviously used to distinguish it from other workspaces. With community and interest-based workspaces, this is not likely to have any real pressure to change over time. For corporate workspaces, this also will generally have very little pressure to change. Unless the company is rebranding or going through a merger or some similar process. In this scenario, a company may want to change the name and the URL of its Slack workspace.
Many services wouldn’t necessarily offer the ability to do that easily, but Slack allows you to change both. Where possible, there aren’t any restrictions on changing these workspace details. For example, you can change the name and URL of a workspace as often as you like.
The main restriction is that you obviously can’t switch to a URL that is already in use. When you change URLs, the old URL will even be configured to redirect to your new URL; however, it will also be added back into the pool that other workspaces can choose to use. This means that someone could take it at any time.
How to Choose Another Name for Workspace or Change URL
If you want to change your workspace’s name or URL, you need to browse to the workspace settings and permissions page. To get there, you first need to click on the workspace name in the top-right corner. Next, in the dropdown menu, select “Settings & administration,” then “Workspace settings” to open the workspace settings in a new tab.

In the default “Settings” tab, click on the “Change workspace name and URL” button for the “Workspace name and URL” settings that can be found second from the bottom.

Once on the next page, you can configure a new workspace name and URL using the respective text boxes. Once you’re happy with the new name and URL, click “Save changes” to apply the change.
Tip: You don’t necessarily need to change both the name and URL; you can choose to change one or the other.

Occasionally, you may want to change your workspace’s name and URL, perhaps because of a rebranding effort. If you follow the steps in this guide, you can change your workspace’s name and URL.
RaphT says
Thanks a lot, you made my day, this was definitly helpful !
(just starting with Slack, making a lot of POCs)
Cheers
Raphael