Hayedeh (Persian: هایده) or Ma'soumeh Dadehbala (Persian: معصومه دده بالا), (April 10, 1942, Tehran, Iran – January 20, 1990, San Francisco) was a Persian classical and Pop singer with a contralto vocal range. In a career spanning more than 20 years, she had many hits. More than two decades after her death, Hayedeh is considered one of the most influential and iconic Persian vocalists recognized as one of the most popular 20th century singers.