Konstantin Dmitriyevich Balmont was a Russian symbolist poet and translator who became one of the major figures of the Silver Age of Russian Poetry.

Konstantin Nikolayevich Batyushkov was a Russian poet, essayist and translator of the Romantic era. He also served in the diplomatic corps, spending an extended period in 1818 and 1819 as a secretary to the Russian diplomatic mission at Naples.

Konstantin Nikolayevich Bestuzhev-Ryumin was one of the most popular Russian Imperial historians of the 19th century. He held a chair in Russian History at the University of St. Petersburg (1864–85) and was elected into the St. Petersburg Academy of Sciences in 1890. In 1878 he founded and gave his name to the Bestuzhev Courses, "the largest and most prominent women's higher education institution in Russia".

Konstantin Biebl was a Czech poet and writer. His first collection of poems was released in 1923, and his last in 1951, the year of his death by suicide. During that time he also travelled widely as a reporter. Biebl was a member of the Communist Party Czechoslovakia, and was closely associated with other Czech Communist writers and poets including Jiří Wolker and Vítězslav Nezval.

Konstantin Anatolevich Bogdanov is a Russian anthropologist and philologist whose areas of investigation covers Russian culture, including folklore, rhetoric, and the history of science and humanities. He has also researched the history of social thought in 18-20th Century Russia.

Konstantin Yuryevich Bogomolov is a Russian theater director, poet, and actor. He has served as the art director of the Theater on Malaya Bronnaya. He is the son of the film critic Yuri Bogomolov. He has been honoured with a Golden Mask Award.

Konstantin (Kosta) Branković was a Serbian pedagogue and publicist from the Kingdom of Hungary. He was one of the first six-member tutorial staff at the Lyceum of the Principality of Serbia in Kragujevac before Belgrade became the capital city and a new Lyceum was opened there.

Konstantin Valeryevich Chernyshov is a Russian chess grandmaster (2000) and a chess coach.

Konstantin Alexandrovich Chkheidze was a Czech-Georgian-Russian writer, philosopher, and White émigré.

Konstantin Nikolayevich Derzhavin was a Russian Soviet literary and theater critic, translator, and writer. He wrote the libretto to Aram Khachaturian's ballet Gayane. His wife was the ballerina Nina Aleksandrovna Anisimova.