What was spocks nationality?

Spock, the iconic character from Star Trek, is a fictional character, and therefore doesn't have a nationality in the way we understand it.

However, his backstory indicates he is half-Vulcan and half-human.

* Vulcans are a fictional extraterrestrial species from the planet Vulcan.

* His mother, Amanda Grayson, was human. She was from Earth, making him partly of Earth origin.

So, while he doesn't have a specific nationality, we can say he has a dual heritage: Vulcan and Earth.