It’s Called a Secret Identity for a Reason

Pssst. Batman is really Billionaire Bruce Wayne. Pass it on…
It’s called a secret identity for a reason

Here are the people in the DC Universe who know who Batman really is:

Dick Grayson (aka Robin, aka Nightwing)
Barbara Gordon (aka Batgirl, aka Oracle)
Alfred Pennyworth
Jason Todd (aka Robin II, aka the Red Hood)
Timothy Drake (aka Robin III)
Cassandra Cain (aka Batgirl II)
David Cain (assasin – currently deceased?)*
Clark Kent (aka Kal-El, aka The Last Son of Krypton, aka Superman)
Dr. Leslie Thompson
Ra’s al Guhl*
Talia (Ra’s daughter)*
Selena Kyle (aka Catwoman)*+
Edward Nigma (aka The Riddler)*
Thomas Elliot (aka Hush)*
Stephanie Brown (aka The Spoiler – deceased)
Bane*
Kirk Langstrom (aka ManBat)*+
Linda Langstrom
Stephen Schleicher (aka Me)
Jean Paul Valley (aka Azrael)
Alan Scott (aka the original Green Lantern)
Harold (Last name unknown) (The hunchback/technical genius who fixed Bat-gear. Deceased)+
Dr. Hugo Strange*
John Law (aka The Turantula Deceased)
Wally West (aka The Flash)
Wonder Woman
The Atom
J’onn J’onzz
Aquaman
Black Canary
(heck, probably everyone in the Justice League)
Lois Lane
The Huntress
Deadman
The Spectre
Vikki Vale (whereabouts unknown)

And those are just the ones that come to mind….
* – indicates characters who are considered villians
+ – indicates characters who may or may not be villians or may have switched to “the good side”.