File Photo: Bahraini citizen with the national flag. AFP
The ministry in a statement listed the dozens stripped of their citizenship, which it said included dependents, adding they "were found to have supported hostile Iranian acts, including colluding with foreign entities".
The Bahrain Institute for Rights and Democracy (BIRD) described the decision as "the first mass revocation of citizenship since 2019".
The rights group said it was unclear whether those affected had been arrested, whether they were inside or outside the country, or whether they held other nationalities.
Iran launched waves of missiles and drones against Gulf states, including Bahrain, in response to US and Israeli strikes on the Islamic Republic that began on February 28.
Tehran accused them of allowing the US to use their territory as launchpads for strikes.
The Iranian attacks, which targeted US military bases in the region as well as critical infrastructure in the Gulf states, have halted since a fragile April 8 ceasefire announced by Washington and Tehran.
The move by Bahrain comes as Gulf countries are on high alert over Iranian infiltration, with Qatar, Kuwait and the UAE cracking down on what they call Iran-related networks.
Some of those detained were accused of treason, while others were arrested for protesting.
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