According to The Business Insider rankings.

Here are the top 12 (we went 12 instead of 10 to make sure more than a measly 1 UK school made it in):

1. Harvard Business School
2. Stanford Graduate School of Business
3. University of Pennsylvania (Wharton)
4. Massachusetts Institute of Technology (Sloan)
5. University of Chicago (Booth)
6. Columbia Business School
7. Northwestern University (Kellogg)
8. INSEAD (Institut Européen d’Administration des Affaires)
9. Dartmouth College (Tuck)
10. London School of Economics
11. London Business School
12. Yale School of Management

For the full results click here.