1. Papua New Guinea
On the top of our list of cosmopolitan most culturally and ethnically diverse countries in the world in 2017 is Papua New Guinea. Its population consists of Melanesian, Papuan, Negrito, Micronesian and Polynesians. Moreover, around 7000 different cultural groups exist in Papua New Guinea, and most groups have their own language. So, in total there are even 840 different languages spoken! In addition, these groups have developed their own expressive forms in arts, dance, and weaponry, to name few.