Wedding invitations are one of the key places where proper etiquette and tradition come in to play. You'll have many people listed on the invitation from the hosts of the wedding to the couple getting married. So, it's important to know the rules regarding using titles on wedding invitations.
The rule of thumb is: the only professional designations that should appear on the invitation are Doctor, Reverend, Judge, or military rank. Everyone else should be referred to as Mr., Mrs., or Miss (never Ms.).
Furthermore, the use of "Doctor" for the purposes of the wedding invitation, refers only to medical doctors. Those with a Ph.D should forego the title on the invitation.
Degrees, such as M.D. or D.D.S., should never appear on the invitation. And putting Esquire or Esq. after an attorney's name on the invitation is considered a major no-no.
If you are including a title other than Mr. or Mrs., don't abbreviate! Spell out titles, such as Doctor or Reverend, completely on the invitation.