Ordinary people with university degrees are just plain Mr/Ms/Mrs/Miss unless they are university professors (Prof) or have a PhD (Dr).
Also, in order to avoid the minefield of irrelevance about whether the women involved are married or not, the somewhat ugly modern catch-all of Ms can be used until the English-speaking world comes up with something better.
HTH.

Since there is no equivalent - in my humble opinion - for this title in contemporary English - I always go through a lot of considerations when translating 'dott' and 'dott.ssa' - I debate whether to substitite with social titles - Mr, Mrs, Ms, and similar - leave it as in the original language - add a comment such as 'this is not a PhD or medical field title' ... finally, I have decided, when it's a question of putting at least something - the best equivalent is 'esquire' - which I truncate as Esq [British (no full-stop (becasue it's a truncation not an abbreviation)] and Esq. [American (because they use periods for these types of truncations)]. Italians use 'dottore' after their 'first degree' or laurea, and because the laurea doesn't equate to the 'English' university system I believe it's imprecise to use any contemporary title. Plus, it's unfair or confusing to suggest 'doctor' because the term 'doctor' is now in use in Italy for people receiving PhD's and medical designations in Italy.

I know this a common debate for translators.

I use 'esquire' to be a polite title placed after a person's name when no other title is used. As no title is used for undergraduates - usually - in English/American systems - I feel dragging out 'esquire' is fair.

It's definitely not a technique common in translating - but I've never found another solution I liked.

Calling somone with a 'laurea' level of study 'doctor' is misleading at best.

I feel the use of 'dottore' in modern Italian society is a recognition of 'social' status more than anything. They same way they use the title 'engineer' or 'lawyer' in front of names - which is not a modern English custom either. Because, 'esquire' is defined - see Wikipedia - as a social title - I find it a suitable equivalent for 'dottore.'

I don't believe 'googling' is much help on this issue - nor dictionaries - so I hope my solution catches on.

I love this definition for 'dottore' in Wikipedia (English) - "Il Dottore is a local angry disruptive busybody who doesn't listen to anyone else from any of the fields that he claims to know about, which is many (medicine, law, etc.). He is traditionally portrayed as having been educated either in Bologna or Padua, which since the Renaissance had two of the most prestigious universities of Italy and Europe." Of course this is 'dottore' in the dramatic sense!

I prefer Tom's suggestion, but this is a way to render the 'dottore' if someone absolutely insists on having their qualification listed - you can list as many (often irrelevant) titles as you want AFTER a name.

I don't know whether you intend to address the people on this list directly or will be listing them. Oliver is right re. addressing the person directly (ie in a letter, invitation, email, etc.)

When not addressing the person directly, but listing him/her, for example on a conference program, these often go after the name:

PhD = Dottore di ricerca (dottorato di ricerca)
MA = Dottore magistriale (specializzazione)
[BA = Dottore (laurea) - I can't say I've ever seen anyone list the BA after their name, and I list it here only for comparative purposes.]

Lawyers often use JD (juris doctor/doctorate).

People who have gone to business school, MBA.

The translation for someone with a "specializzazione" is tricky, because in addition to the Master of Arts (MA), there is also the MS (Master of Science), the MArch (Master of Architecture), MFA (Master of Fine Arts), and etc.

Although, as Tom in London wrote, such lists sometimes don't include such information because its assumed, for example in a small field where everyone knows each other.

I'm sure of this, if it is for an American context, because I'm an academic (now Ph.D., but before that MPhil, and before that MA) and have been dealing with this issue for a decade and a half. :-)

What I am not sure of is how you need to use the names. So, if you need to write to these people individually, I would go with Oliver's answer. And definitely, Ms. is what female professionals in America use, regardless of marital status.

One common method of dealing with titles is to simply keep the original, but put them in italics (corsivo).

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Note added at 21 hrs (2010-06-16 07:30:09 GMT)
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Glad you mentioned that Ambra, I had meant to say it. Once I put all the titles of the top managment of a very large and austere company in Italics on this basis. Then my contact in the company (at a much lower level) just said "Cav Lav" looks silly in English and she demoted them all at a stroke. Luckily none complained :)