Valentin D. Ivanov is a Bulgarian astronomer working in the European Southern Observatory, mainly at the Paranal site. Among his primary research areas are the dynamics of star clusters, formation of stars, brown dwarfs, and exoplanets around such objects.

Valentin Petrovich Kataev was a Russian and Soviet novelist and playwright who managed to create penetrating works discussing post-revolutionary social conditions without running afoul of the demands of official Soviet style. Kataev is credited with suggesting the idea for The Twelve Chairs to his brother Yevgeny Petrov and Ilya Ilf. In return, Kataev insisted that the novel be dedicated to him, in all editions and translations. Kataev's relentless imagination, sensitivity, and originality made him one of the most distinguished Soviet writers.

Valentin Yuryevich Katasonov is a Russian scientist-economist, Doctor of Economics. He is associated with the Strategic Culture Foundation (SCF).

Valentin Konstantinovich Khromov was a Russian poet.

Valentin Khristoforovich Kolumb was a Mari poet.

Valentin Krasnogorov ; born 20 December 1934, Leningrad, now St. Petersburg, is a Russian-Israeli playwright and writer.

Valentin Yakovlevich Kurbatov was a Russian literary critic, prose writer, jury member of the Yasnaya Polyana Literary Award, member of the Writers' Union of Russia. He was also member of the Public Chamber of Russia from 2010 to 2014 and member of the Presidential Council for Culture. He was holder of the Medal of Pushkin, Order of Friendship and laureate of the State Prize of the Russian Federation (2020) in the field of literature.

Valentín Lamas Carvajal (1849–1906) was a Spanish journalist. He was one of the founders of Royal Galician Academy.

Valentin Vladimirovich Ovechkin was a Soviet writer, playwright, and journalist.

Valentin Nikolayevich Parmon is a Russian scientist who is credited with inventing new and improved catalytic processes in the field of energy technology.