If Batman got married whom would he not invite?

As well as former girlfriends Bruce Wayne would be unlikely to invite anyone who would risk exposing his dual identity nor would he invite any enemies. Depending on whom he was marrying, he would probably not invite anyone his fiancee would not want there.

Pretty much the same way you'd write an invite list to be honest.

This question was asked on the Family Feud, with the following answers:

Family Feud:

The Joker
Catwoman (Selina Kyle)
Penguin (Oswald C. Cobblepot)
Riddler (Edward Enigma)
 

Other answers:

Enemies:
Scarecrow
Bane - he broke his spine.
Killer Croc
Poison Ivy
Harvey 'Two-Face'
Mr. Freeze
Raz Al Ghul
Falconi
Clayface
Manbat
Harley Quinn
The Pharaoh
Anarky
Speedy
Deadman
Random criminals or henchmen.

People who would not be able to accept an invitation:
His Parents.
His Parents' murderer.
Rachel Dawes.

People not in the Batman Universe:
You
Me
Michael Jackson
Chuck Norris
Wolverine
Spiderman
The Goblin
Tony Stark
Megaman
Chef Boyardee
Dayman of its always sunny in Philadelphia
Craig Martin
Joel Schumacher
George Clooney

---

Robin. He wouldn't invite Robin.

...I mean, would you want Robin at your wedding? Neither would Batman!



Batman probably wouldn't get married but his alter ego Bruce Wayne could.

There have been many different incarnations of Batman over the years and in a few he has been married (notably to Selina Kyle aka Catwoman in one version), though this was not canon.
Joker for one.