If I get married, but don't change my last name... can I still put my title down as Mrs. ...?

No, you aren't Mrs. unless you take his surname.

So you will be Ms. only.

Just a consequence of your choice!

Your (somewhat antiquated) "social" title would be Mrs. Brown, yes.

However, you could still go by Ms. Smith.

Mrs. Smith, however, would be your mother, assuming she married your father.

I'm pretty sure that it would be Ms. Smith because Mrs. Smith technically would be your mom.

My mother does that (UK), calling herself Mrs [her maiden name]. But it causes havoc with other things for example bank accounts, mortage, loans, booking holidays as a family is harder, passports sometimes go to the wrong place, often if one of us (husband or kids) signs for a package for her they will say "Hey, you're not her family!" and apologise and drive back to the post office regardless of what we say.

Pretty much every legal/official thing we do is a real pain in the *** because of it. Even school reports were messed up frequently, and she often didn't receive invitations to parents evenings and such - they assumed my father was a widower.

Where I live (province of Quebec, Canada), woman have no choice but keeping their maiden name when they marry. It's like that since 1981. I thought they did it to look open to women's right and all, but no, they did it to save time on name-changing paperwork! So here, all married women are Mrs. (Maiden name). It kind of sucks because I would have wanted to take my husband's last name.

You would be Mrs. Smith. "Mrs" means you are married. "Ms" can also be used but it is mainly used if people aren't sure if you are married or not. That way they can offend you!

u dont even have to change your name if you dont want to! you can keep it the same! I had to go to the sso to change my name! I can change it back anytime I want to! my licence as well u can still be married and keep your maiden name.

No, it is a felony to do that ... whatever it is you are talking about.