What nationality was king David?

Answer 1

David's nationality was Israelite.

See: More about King David

Examples of other nations at the time would include Edomites, Moab, Ammon, Egypt, etc.

The words for "nation" (Genesis 10:5, 25:23, and Exodus 1:9) predate David by many centuries, though the concept may have changed somewhat over the course of time.

Answer 2

King David ruled the United Kingdom of Israel, so his nationality would have been Israelite and his tribal affiliation would have been Judahite, since he was from the Tribe of Judah. However, the concept of nationality is much more recent than King David would have lived, so this is really an anachronism.

Answer 3

David, a descendant of Boaz and Ruth, had an ancestry running back through Perez to Judah. His lineage would make him a Hebrew, or a Jew.