It's the biggest game on the planet, with (probably) the biggest following to boot. So yeah, there are people all over the world dressing up as League of Legends characters, and they are doing a damn fine job of it.
This gallery collects some of the best examples of League of Legends cosplay from across the planet. Some of it is current, some of it is years old, all of it is excellent.
If you've got a particular favourite that you think I've missed or overlooked, let me know!