Only in the US.
From Wikipedia, the free encyclopedia:
Milky Way is a brand of chocolate-covered confectionery bar manufactured and marketed by Mars, Incorporated. There are two varieties: the US Milky Way bar, which is sold as the Mars bar worldwide, including Canada; and the global Milky Way bar, which is sold as the 3 Musketeers in the US and Canada. (In Canada neither bar is sold as Milky Way.)