Hayedeh (Persian: هایده‎), born Masoumeh Dadehbala (معصومه دده بالا, April 10, 1942 – January 20, 1990) was an Iranian singer with a contralto vocal range. In a career spanning more than two decades, she had countless number of hits. Two decades after her death, Hayedeh is considered one of the most influential and iconic Persian vocalists of all time and is still recognized as one of the Iran's most famous and distinguished singers of the 20th century.