Advani, addressing a gathering of Bahai community here and people of different faiths, said the seven Bahai leaders were being subjected to "torture and persecution" and it would be a great service to urge the Iranian government to release them.
The BJP leader along with former Attorney-General Soli Sorabjee, Imam Umer Ahmed Ilyasi, Chief Imam of the All India Organisation of the Imams of Mosques and others signed the appeal which would be sent to the Iranian Embassy and the Ministry of External Affairs.
In an apparent reference to the Emergency, he said, democracy in India had been a great success, except for a brief period of 19 months when his colleagues and even he himself had been jailed for 19 months.
Except for that patch, we have been a proud democracy and in this proud democracy, all people are accepted and so far religions are concerned, they are respected, he added.
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Their 20-year sentences were longest given to any current prisoners of conscience in Iran and are lodged in Iran's two notorious jails, she said.
In the joint appeal, the community said the harshness reflects the (Iranian) government's resolve to completely oppress the Iranian Bahai community.
"We call for their immediate release, along with the countless other prisoners of conscience in Iran," the community said.