Can you marry on a tourist visa?
The short answer is "yes". You can always get married. Perhaps your real question is:
Can you marry on a tourist visa and adjust your status?
The short answer to this is "yes". It happens all the time. It's extremely common and a lot of people do it, but all the same rules still apply. If you came here on tourist visa with the intent to get married, that's not technically allowed. You're not supposed to do that. Now if you came here on tourist visa and while you were here you met somebody, fell in love and got married, that's allowed. But it will be up to you to prove that and, of course, you need to be honest and obviously, you don't want go into an interview saying you didn't come here with the intent to marry when in fact your did because now you're lying and that's never what you should do.
Reports have been made that the State Department may soon enforce a "90 day rule", which may affect these cases. But at the time of this writing, we haven't seen this be an explicit issue that has affected any cases. As we've always said, the intent of a tourist visa is to be a visitor, not to marry an stay. That would be the purpose of a fiance visa. Please call us if you have any questions about this.