
Married women have long been able to study abroad, but only provided they have the written permission of their husbands.
Blocked
The Guardian Council, which decides whether legislation confirms with the constitution and Islam, is dominated by conservative clerics.
Earlier this year it blocked the bill on religious grounds and sent it back to parliament to be amended.
It approved the bill only after the reformist-dominated parliament agreed that an unmarried women must have the written permission of her father before leaving the country.
Lawmakers say the bill will give women access to scientific studies not available in Iran.
The status of women in Iran has improved steadily since the election of reformist President Mohammed Khatami in 1997