What Does "Nest Label Under" Mean in Gmail?

Last updated: September 13, 2026

"Nest label under" makes one Gmail label a sublabel of another. Under the hood, it's just a naming convention: nesting a label called Invoices under one called Clients renames it to Clients/Invoices, and the slash is what makes Gmail render it as a child in the sidebar.

Where to find it

There are two places this option shows up:

  1. Creating a new label. Click Create new label at the bottom of the sidebar (under "More" if the sidebar is collapsed), type the child's name, tick Nest label under, and pick the parent from the dropdown.
  2. An existing label. Hover it, click the ⋮ menu, and choose Add sub-label. This opens the same dialog with Nest label under already ticked and the hovered label pre-filled as the parent. You can also get here through Edit on an existing label and ticking the box yourself.
The parent has to exist first. You can't create a label and nest it under a brand-new parent in the same step. If the parent doesn't exist yet, create it, then come back and nest the child under it.

What it actually does

Nesting is a rename, not a new kind of object. Clients/Invoices is a single label whose name happens to contain a slash. That's also why you can skip the checkbox entirely and just type a label name with a slash in it directly, and why Gmail's interface only exposes one level of nesting through the dialog: deeper trees mean typing longer paths by hand, like Clients/Brightlane/Invoices.

It follows that a rename cascades. If you rename Clients to Accounts, every child label updates automatically, because each child's name is literally the parent's name plus a slash plus its own name. Deleting the parent unindents the children back to the top level rather than deleting them or their mail.

What it doesn't do

This is the part that trips people up most. A nested label is still a completely independent label, so:

None of that is a bug. It's a consequence of nesting being implemented as a naming pattern on top of a flat tagging system, rather than a real parent/child data structure the way folders work.

If what you want is a folder where filing a message under a child automatically counts as filing it under the parent too, and clicking the parent shows everything beneath it, that's a different piece of software than Gmail's label sidebar. See getting a real nested folder tree in Gmail.

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FAQ

What does "Nest label under" mean in Gmail?

It makes one label a sublabel of another. Gmail implements this as a naming convention: nesting Invoices under Clients renames it to Clients/Invoices, and the slash creates the parent/child relationship in the sidebar.

Where do I find the Nest label under option?

When creating a new label, or by hovering an existing label, clicking the three-dot menu, and choosing Add sub-label, which fills in Nest label under automatically. Editing an existing label exposes the same checkbox.

Can I create a label and its parent at the same time?

No. The parent has to already exist before you can nest a new label under it. Create the parent first, then nest the child.

Does applying a nested label also apply its parent?

No. A nested label is an independent label that happens to display as a child. Applying Clients/Invoices doesn't also apply Clients, and clicking the parent won't show the child's mail.

What happens if I rename or delete a parent label?

Renaming a parent re-parents every child automatically, since the child's name is just the parent's name plus a slash. Deleting a parent unindents the children back to the top level; it doesn't delete the children or their mail.

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