Siavash Ghomayshi (Persian: سیاوش قمیشی; born 11 June 1945, Ahvaz) is an Iranian musician, singer and songwriter.

Over the past four decades, he composed songs for artists like Ebi, Moein, Googoosh, Aref, Mansour, Leila Forouhar, Shohreh Solati and others.

Siavash holds a master's degree in classical jazz from Royal Society of Arts in London, England,[2] where he majored in pop music.

He lived in Iran until the age of 33, then decided to leave the country once again to pursue his career in the United States.

Because of the popularity of Siavash's voice among young generation, in recent years many singers have followed his style.