Behbahani had been hospitalised and unconscious in Tehran since August 6 and later died of heart failure and breathing problems, Iran's official IRNA news agency reported.
Behbahani, born Simin Khalili on July 20, 1927, saw her poetry often used by Iranian singers as the basis for love songs. Her poems came in a variety of styles, far from classical and routine forms normally associated with Persian prose.
US President Barack Obama even once recited her work in a video message in honour of Nowruz, the Persian New Year, saying: "Old I may be, but, given the chance, I will learn."
Saeed Hamidian, a literature professor at Tehran Allameh University, praised Behbahani for her focus on politics and societal issues.
However, Behbahani's work also saw her targeted by authorities. In 2010, Iranian authorities barred her from leaving the country to attend an International Women's Day event in Paris. In 2006, authorities shut down an opposition newspaper for printing one of her works, an editor there said at the time.
In his 2011 video, Obama described Behbahani as "a woman who has been banned from travelling beyond Iran, even though her words have moved the world."
The poem ends: "You may wish to have me burned or decide to stone me / But in your hand, match or stone will lose their power to harm me.
