Recover deleted iPhoto photos (OS X EL CAPITAN 10.11.6)?

If you are using iPhoto then exactly the same as always - go to the iPhoto Trash and restore them

If instead you are using Photos (an new and totally different program) then post in the Photos for Mac forum - in Photos you open the recently deleted album, select the photos and right click and recover from there

LN

To add to Larry's suggestion if you've already emptied the iPhoto Trash bin or Photos Recently Deleted album your only recourse is to restore a backup copy of the library that was made prior to your deletion of the photos.

Restore the library to a different location so you don't overwrite your current library.

You are welcome

LN