Radu Marian is a Romanian/Moldovan male soprano or sopranist.

Marian possesses a pure soprano voice in the range of C4 to C6, and he is considered an important singer in Baroque music. His repertoire incorporates cantatas written for soprano by composers like Handel, Bononcini, Carissimi, and Frescobaldi, and the repertoire of the old castrati. Marian has been called "the Baroque nightingale" by the renowned Italian newspaper Corriere della Sera.

Marian is an "endocrinological castrato" or "natural castrato". A natural castrato is a singer who never went through puberty and so kept his "unbroken" voice intact.

Marian was born in 1977, in what was then the Moldavian Soviet Socialist Republic, to a family of artists. His talent was first recognized publicly in 1989, at the International Festival of Creation in Moscow, where he took the Laureate prize.

In 1990, at the age of 13, Marian was awarded first prize at the Extraordinary Talents International Festival in Chisinau. Afterwards, his concert career flourished, and he also continued his singing and piano studies in Moscow and in Bucharest.

Marian moved to Italy in 1999. In Rome he studied with conductor and countertenor Flavio Colusso, and with Colusso he performed the unabridged operas of Giacomo Carissimi throughout Europe. In 2000 Marian recorded his first album, Alia Vox.

Marian is a regular guest at some of the most prestigious European music festivals. He has performed at the Festival dei Due Mondi in Spoleto, the Avignon Festival, and the Vilnius Festival. He has also performed at the Musikverein and Konzerthaus in Vienna, the Concertgebouw in Amsterdam, the Maestranz Theatre in Seville, the Oratorio del Gonfalone in Rome, the Hermitage Theatre in St. Petersburg, and the Galina Vishnevskaya Theatre in Moscow.