i think the USA with Bill Gates...

US becsuse bill gates is there

I am going to get flack for this, but it is not the US, owing to their massive debt. Their balance of payments are so far in the red, China has the economy by the short and curlies. How did it come to this, the US used to have a surplus, now its debt numbers in the trillions of dollars.

The United States of America is by a long long way the wealthiest nation in the world. It has the largest economy by most measurements including National Gross Domestic Product, Purchasing Power Parity etc. The USA's economy takes up a huge part of the global economy and if it was to crash it would drag the whole world into economic depression (an example of this being the Wall Street Crash of 1929). Edit: Well it seems I was probably incorrect. I would hazard a suggestion that the USA is the wealthiest nation if you ignore its debt.

Should be Russia if they can get their act together and stop the black marketeering

Your question is very vague. Does wealthiest mean having the most amount of resources or technical advances? Is it simply money, if so, which way? Is it the amount of money we have at this moment? Do you want a ratio of our economy's activity to our currency?

US of A

The United States of America is the most powerful nation in the world. Switzlerland is currently the wealthiest of all countires in the world right now.

hmmmm...haard one... Lichtenstein ?

I BELIEVE ITS LUXEMBOURG. A GOOGLE SEARCH GOT ME MY ANSWER.

I must be Iraq. The US just spend (a reported) 136 Billion there in 7 years

In terms of GDP (any way you calculate it) and GNP, it's still the USA by far: China and the rest of the G8 combined still don't equal the US in these terms. In terms of average citizen wealth/standard of living (usually measured by per-capita GDP), it's a contest between the tiny European states (Luxembourg, the Channel Islands, Lichtenstein, Switzerland, Monacco, Belgium, and some will still argue for Sweden or Norway.) But in terms of net-worth, it's impossible to say just now as the governments of, and major investors/banks from, China, Japan, Saudi Arabia, South Korea, Singapore, Taiwan, the U.A.E. and a few other countries pretty much hold the note on America, but now the value of those claims, and the assets which secure them, is plumetting rapidly. The country in the best position to weather and even flourish during the coming storm is probably Brazil. It's fabulously wealthy in a huge range of resources; has a massive, growing and still cheap labor force; is free of bad investments in the US, UK, and EU; and their economy is not dependent on other countries as either consumers or suppliers. It will almost certainly be one of the major 2-5 gobal powers by 2050.