Signore = Mr.
Signora = Mrs.
Signorina = Miss
Avvocato = Lawyer
Ingegnere = Engineer
Professore = Masculine professor
Professoressa = Feminine professor
Dottore = Masculine doctor
Dottoressa = Feminine doctor
Insegnante = Teacher
On those masculine titles that end with 'ore'; the final 'e' is dropped before the person's last name:
Signor Bianchi = Mr. Bianchi
Professor Ricci = Professor Ricci
Feminine titles remain unchanged.