From the FAQ's (<a href="http://ycombinator.com/faq.html" rel="nofollow">http://ycombinator.com/faq.html</a>)<p>Do we have to start a company in the US for you to invest in us?<p>Yes, but that's usually not a problem. It's easy for foreign nationals to start US companies (much easier than remaining here physically), and investors and acquirers prefer them.<p>Do we have to be US citizens?<p>No, as long as you can get here for at least three months. We've funded many startups founded by non-citizens.<p>Can you get us visas?<p>No, sorry, we don't do that. You'll have to figure out visas for yourself. If you know people from previous YC-funded companies who came from outside the US, we suggest you ask them for advice. They understand the options better than we do.