Ferenc Demjén (b. 1946) is a Hungarian pop singer-songwriter and bassist. Besides a solo career, he was a member of bands Bergendy and V'Moto-Rock, and played an important part in the pop culture of the country, contributing to nearly 150 albums.

Demjén was born on the 21st December 1946 in Diósgyőr, Hungary. His father was an engineer at the Diósgyőr Steel Company, and after he was fired because of political reasons, the family moved to Budapest, where he got a ministry job. Demjén, who graduated as a chemist technician, was inspired by his fathers singing talent, and started to study music, largely on his own.

After starting as a bassist in bands Számum, Liversing, Dogs, Meteor, Sakk-Matt, Tűzkerék, and Szabadság Szálló Kulcsár, he met István Bergendy in 1970, who invited him to play in his band. He debuted as a song-writer with "Jöjj vissza vándor," scoring his first success, resulting in weekly performances in the popular E-Klub and Ifjúsági Park. They gained country-wide popularity by performing on the National Television show at New Year's Eve in 1970. Their first open concert was in 1971 in the Kisstadion stadium. In 1972 they won second place in the year's Táncdalfesztivál with the song "Úgy Szeretném".

Demjén left the band in 1970; he released his first solo album and started the band V'Moto-Rock in 1977. He worked with Klári Katona and Kati Kovács on their first albums. His song for the film Szerelem első vérig (1987) topped the Hungarian charts for eight months. After V'Moto-Rock disbanded in 1988, Demjén began a solo career, releasing an album almost every year in the 1990s.

He received the Order of the Hungarian Republic, Officer's rank in 1996.

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