The activist, 24-year-old Delaram Ali, was among dozens of people arrested in June 2006 for protesting in Tehran against articles in Iranian law seen as discriminatory against women.
Ali was initially sentenced to more than two years' imprisonment plus 10 lashes.
Her lawyer, Nasrin Sotoodeh, told Radio Farda the suspension was temporary while the judiciary decided whether to review the case.
“Implementing of the sentence, both prison verdict and lashes, has been suspended for now," Sotoodeh said. "We hope that in the next two weeks during which the implementation has been postponed, there will be a reconsideration and she will be found not guilty.”
Five other women activists who organized the 2006 protest were earlier this year given jail terms of up to a year, with suspended sentences of up to three years.