Restore a deleted folder in a Git repo

Everything you can do with a file, you can do with a folder too.

Also note Find and restore a deleted file in a Git repository

Files are deleted from working tree but not committed yet:

If you have not yet indexed (git add) your changes you can revert content of a directory:

git checkout -- path/to/folder

If the deletion is already indexed, you should reset that first:

git reset -- path/to/folder
git checkout -- path/to/folder

Restore the full working tree (not a single folder), but lose all uncommitted changes

git reset --hard HEAD

When files are deleted in some commit in the past:

Find the last commit that affected the given path. As the file isn't in the HEAD commit, this commit must have deleted it.

git rev-list -n 1 HEAD -- <file_path>

Then checkout the version at the commit before, using the caret (^) symbol:

git checkout <deleting_commit>^ -- <file_path>

Restore the full working tree from a distant commit

git reset --hard <revision> 

If you have not yet commited your changes you can revert content or a directory:

git checkout -- removed_directory

If you want to revert all changes do:

git reset --hard HEAD

You can restore files or folder with git restore.

git restore --source master~1 "PATH_IN_YOUR_REPO"

Here, master~1 reverts your folder to "1" revision back from your master branch.

Source: https://git-scm.com/docs/git-restore