I can report from personal experience that if you have a passport from the US, Canada, or Australia, you do not need a visa for Argentina, but you do need to pay the "reciprocity fee" which not at all by coincidence costs the same as the visa fee charged for Argentines visiting the US, Canada, or Australia. You *must* pay the fee and print the receipt before you get on the plane; if you don't have one they shouldn't let you on the plane, and if you arrive without one, they'll probably send you home (according to a friend who saw it happen.) You pay the fee online at https://reciprocidad.provincianet.com.ar/ Start with the small SIGN UP link below the login box, then once you've set up an account you can pay the fee with a credit card. They provide a PDF that you print and stick in your passport. The receipt is good for the same time as the corresponding visa, 10 years for the US, so if you have been to Argentina before, e.g. you went to ICANN last year, your receipt may still be good. If you lost it, you can log into the web site and reprint it. If you have a new passport, the receipt is still good (personal experience again) but since the receipt has your passport number I'd bring the old passport just in case. R's, John