Nico & Vinz -- 'Am I Wrong' Singers ... Yes, We're Black AND We're Norwegian

Nico & Vinz have one of the hottest songs this summer with "Am I Wrong" ... but most of their fans are probably DEAD wrong -- 'cause they don't realize the guys are from Norway, and they're Black!

We ran into the duo in NYC yesterday, and they said they get double-takes all the time -- but the guys (both born in Oslo) want America to know ... it's okay ... there REALLY are black people in Norway. Lots of 'em.

Nico and Vinz are pretty charismatic in this clip, but what's disappointing is their taste in summer anthems. We asked 'em to name their faves -- and one of 'em is ... well, let's just say their hit is MUCH better.