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Kniaz’ or knyaz is a word found in some Slavic languages, denoting a nobility rank. It is usually translated into English as either Prince or Duke, although the correspondence is not exact.

The title is pronounced and written similarly in different Eastern European languages. In West Slavic languages, such as Polish and Sorbian, the word has later come to denote "lord", and in Czech, Polish and Slovak also came to mean "priest" (kněz, ksiądz, kňaz) as well as "duke" (kníže, książę, knieža).

The etymology is directly related to the English King, the German König, and the Scandinavian konung. It is probably cognate to Proto-Germanic *Kuningaz, like the Finnish and Estonian (Kuningas).

The meaning of the term changed over the course of history. Initially the term was used to denote the chieftain of a tribe. Later, with the development of feudal statehood, it became the title of a ruler of a state among East Slavs (княжество, kniazhestvo, traditionally translated as duchy or principality), for example, of Kievan Rus'. In medieval Latin sources the title was rendered as either rex or dux.

As the degree of centralization grew, the ruler acquired the title Velikii Kniaz (Великий Князь) (translated as Grand Prince or Grand duke, see Russian Grand Dukes). He ruled a Velikoe Knyazhestvo (Великое Княжество) (Grand Duchy), while a ruler of its vassal constituent (udel, udelnoe kniazhestvo or volost) was called udelny kniaz or simply kniaz.

When Kievan Rus' became fragmented in the 13th century, the title Kniaz continued to be used in East Slavic states, including Novgorod, Vladimir-Suzdal', Muscovy, Tver, Halych-Volynia, and in the Grand Duchy of Lithuania.

Kneaze Alexey Michailovitz, 1664

As Muscovy gained dominion over much of former Kievan Rus', Velikii Kniaz Ivan IV of Russia in 1547 was crowned as Tsar. Since the mid-18th century, the title Velikii Kniaz has been revived to allude to sons and grandsons (through male lines) of the Russian Emperors. See titles for Tsar's family for details.

Kniaz continued as a hereditary title of Russian nobility patrilineally descended from Rurik (e.g., Repnin, Gorchakov) or Gediminas (e.g., Galitzine, Troubetzkoy). Members of Rurikid or Gedyminid families were called princes when they ruled tiny quasi-sovereign medieval principalities. After their demesnes were absorbed by Muscovy, they settled at the Moscow court and were authorised to continue with their princely titles.

Since 18th-century, the title was occasionally granted by the Tsar, for the first time by Peter the Great to his associate Alexander Menshikov, and then by Catherine the Great to her lover Grigory Potemkin. After 1801, with the incorporation of Georgia into the Russian Empire, various titles of numerous local nobles were controversially rendered in Russian as "kniazes". Similarly, many petty Tatar nobles asserted their right to style themselves "kniazes" because they descended from Genghis Khan.

Finally, within the Russian Empire of 1809-1917, Finland was called Grand Duchy of Finland (Velikoe Kniazhestvo Finlyandskoe).

In the 19th century, the Serbian term knez (кнез) and the Bulgarian term kniaz (княз) were revived to denote semi-independent rulers of those countries, such as Alexander Karađorđević and Alexander of Battenberg.

• List of Grand Dukes of Russia
• List of Grand Duchesses of Russia