iCloud Photo Library Help

Welcome to the Apple community.

Firstly, if you have deleted an album, then the photos themselves won't have been deleted unless you specifically deleted them from your library. Look in 'Photos' (moments) to find the photos and recreate the album.

If by whatever chance, you did also delete the photos themselves from your library, they will have been moved to the deleted photos album where they will stay for 30 days before being permanently deleted. The deleted photos album can be accessed from the file menu on your computer or 'albums' section on a mobile device.

Unfortunately you will need to recreate it again, you can't undo the deletion of a shared library.