What the Other Person Sees When You Delete Their Comment
When you delete a comment someone left on your post, it's removed for everyone with no notification sent to the author. From their side: no alert, no DM, no entry in their notifications tab.
The only way they'd notice is by deliberately going back to your post and seeing their comment is gone. Most people never do.
Deleting vs Hiding: An Important Difference
Deleting removes the comment for everyone, permanently.
Hiding (via filters or manual hide) makes the comment invisible to everyone except the author and their friends—so the person who wrote it still sees it on their screen and assumes it's live. This is why hiding is often the smarter move for spam or mild negativity: it avoids confrontation entirely.
Neither action triggers a notification.
Can They Tell If You Blocked or Restricted Them Instead?
If you Restrict someone, their future comments show only to them—again, silent. If you block them, they aren't notified but may notice your profile disappears. None of these moderation actions send an alert.
Bottom line: every way of removing or limiting a comment on Instagram is silent by design.
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Frequently Asked Questions
Will someone know if you delete their comment on Instagram?
No. Instagram does not send any notification when you delete a comment. The author can only find out by revisiting the post and noticing it's gone.
Does the person get notified if I hide their comment?
No. Hiding is silent too. The difference: a hidden comment still shows to its author (and their friends), so they usually don't realize anything changed.
Can I tell who deleted a comment?
On your own post, only you and any admins can remove comments, so you know it was you or your team. There's no public log of deletions visible to others.
Is it better to delete or hide a negative comment?
Hiding is usually better for spam or mild negativity—it removes the comment from public view without confrontation, since the author still sees it. Delete when you want it permanently gone.