| Konstantin Konstantinovich | |
|---|---|
 Photograph, c. 1891 | |
| Born | 22 August 1858 Constantine Palace, Strelna, Saint Petersburg, Russian Empire |
| Died | 15 June 1915 (aged 56) Pavlovsk Palace, Pavlovsk, Russian Empire |
| Burial | Grand Ducal Burial Vault, St. Petersburg, Russian Empire |
| Spouse | |
| Issue | Prince John Constantinovich Prince Gabriel Constantinovich Princess Tatiana Constantinovna Prince Constantine Constantinovich Prince Oleg Constantinovich Prince Igor Constantinovich Prince George Constantinovich Princess Natalia Constantinovna Princess Vera Constantinovna |
| House | Holstein-Gottorp-Romanov |
| Father | Grand Duke Constantine Nikolaevich of Russia |
| Mother | Princess Alexandra of Saxe-Altenburg |
Grand Duke Konstantin Konstantinovich of Russia (Russian: Константи́н Константи́нович, IPA: [kənstɐnʲˈtʲin kənstɐnʲˈtʲinəvʲɪtɕ] ; 22 August 1858 – 15 June 1915) was a grandson of Emperor Nicholas I of Russia, and a poet and playwright of some renown. He wrote under the pen name "K.R.", initials of his given name and family name, Konstantin Romanov.