Constantin Virgil Gheorghiu was a Romanian writer, best known for his 1949 novel, The 25th Hour.

Gheorghiu was born in Valea Albă, a village in Războieni Commune, Neamț County, Romania. His father was an Orthodox priest in Petricani. A top student, he attended high school in Chișinău from 1928 to June 1936, after which he studied philosophy and theology at the University of Bucharest and at the Heidelberg University.

He traveled to Saudi Arabia to learn the Arabic language and the Arab culture, before writing a biography of Prophet Mohammed. The book was translated from Romanian to French, Persian in Iran, and Urdu in Pakistan.