North America, Europe, Asia (specifically Russia), and Africa mostly. There might be some odd species in South America, I’m not familiar with the SH. As for the Americas, Mexican wolves were long thought to be extinct as there had not been a sighting for a decade or two. A wildlife biologist began a breeding program in Minnesota, however, to grow the Mexican wolf population. Red wolves, too, endured a similar situation where the only living species were those held in captivity. However, they have been slowly reintroduced and been placed the wild. There are some weird African varieties too.
Gray wolves are by far the most common, far more than Timbers or any other species. In the States, they thrive in the West and northern Great Lakes areas (Minnesota, Michigan, and Wisconsin). There have just been reports of potentially two packs in Northern California (suggested but not officially confirmed), but they also live in Utah (deserts and mountains alike), Wyoming, Colorado, Idaho, Montana, New Mexico, and Alaska. They thrive in mountainous environments, but also in (as previously mentioned) the forests of MN, WI, and MI.
They might occasionally come out into the prairies nearer the Rockies, but generally it’s safer and more reliable to be in the middle of nowhere. Ask away mate.