Niklas Carl Bosson Natt och Dag is a Swedish novelist. He debuted with the acclaimed historical detective novel The Wolf and the Watchman, the first part of the Bellman noir trilogy, followed by The City Between the Bridges and 1795.

Niko Grafenauer is a Slovenian poet, essayist, literary historian, editor and translator. He is particularly known as author of popular children literature, and for his active participation in the Slovenian public life, especially in conservative and liberal conservative platforms.

Niko Lomouri (Georgian: ნიკო ლომოური; 7 February 1852 – 17 April 1915) was a Georgian writer and educator.

Niko Nikoladze was a Georgian writer, pro-Western enlightener, and public figure primarily known for his contributions to the development of Georgian liberal journalism and his involvement in various economic and social projects of that time.

Nikodim Pavlovich Kondakov, was an art historian with special expertise in the history of Russian and Serbian Christian icons. He is remembered as a pioneer among art historian who studied the treasures of Mount Athos like Frenchman Gabriel Millet.

Nikola Yoradnov Furnadzhiev was a Bulgarian poet and translator.

Nikola Milošević, PhD was a Serbian writer, political philosopher, literary critic, and politician.

Nikola Tesla was a Serbian-American inventor, electrical engineer, mechanical engineer, and futurist best known for his contributions to the design of the modern alternating current (AC) electricity supply system.

Nikola Yonkov Vaptsarov was a Bulgarian poet, communist and revolutionary. Working most of his life as a machinist, he only wrote in his spare time. Despite the fact that he only ever published one poetry book, he is considered one of the most important Bulgarian poets. He's also revered in North Macedonia. Because of his underground communist activity against the government of Boris III and the German troops in Bulgaria, Vaptsarov was arrested, tried, sentenced and executed the same night by a firing squad.

Nikolai Yakovlevich Agnivtsev, also known as Nikolai Agnivtsev, was a popular Russian poet, writer, and playwright.