The issue has drawn renewed attention in the reformist newspaper Etemad, which is close to President Masoud Pezeshkian's administration.
In an article published Thursday, the newspaper examined proposals reportedly discussed in senior state consultations to consolidate the two agencies into a more unified and accountable intelligence structure.
Iran's Intelligence Ministry remains without a permanent chief nearly eight months after Esmail Khatib was killed in an Israeli strike in March, while parliament considers separate legislation to overhaul the ministry's leadership.
The two agencies have long operated alongside one another, with overlapping responsibilities and competing centres of authority.
A history of rivalry
Iran's intelligence apparatus encompasses several organisations, but the Intelligence Ministry and the Islamic Revolutionary Guard Corps (IRGC) Intelligence Organisation are its two most prominent institutions.
The ministry operates within the government, with its chief nominated by the president and approved by parliament. The IRGC's intelligence arm belongs to a military organisation operating under the supreme leader's command.
Their competing authority has occasionally produced disagreements over investigations and the treatment of detainees.
During the late 2010s, one prominent dispute involved environmental activists arrested by the IRGC Intelligence Organisation on espionage charges. Another concerned more than 50 people reportedly accused of spying for Israel.
In both cases, the Intelligence Ministry publicly challenged allegations advanced by the IRGC Intelligence Organisation.
Some former detainees subsequently told Iranian and Persian-language media outside the country that the ministry had apologised for their detention and offered compensation.
A sensitive debate
Writing in Etemad, journalist Mehdi Beik-Oghli examined longstanding concerns about overlapping mandates, institutional rivalries and legal accountability within Iran's intelligence system.
His analysis also explored the qualifications required for senior intelligence officials and the difficulties of maintaining separate security institutions with overlapping responsibilities.
Etemad is widely regarded as one of the newspapers closest to Pezeshkian's administration. Its proprietor, Elias Hazrati, serves as a senior government media adviser.
The article does not establish whether a merger has been formally proposed by the government or endorsed by senior decision-makers, but its publication brings a sensitive question about Iran's intelligence establishment into a prominent government-aligned newspaper.
Leadership vacuum
Iran's parliament is preparing to consider separate legislation that could fundamentally change the leadership structure of the Intelligence Ministry.
Parliamentary presidium spokesman Abbas Goudarzi said Tuesday that an urgent bill would remove the longstanding requirement for the intelligence minister to possess ijtihad, an advanced qualification in Islamic jurisprudence.
Since the ministry's establishment in 1984, all its permanent ministers have been clerics.
The proposed legislation would allow a non-cleric to take the position while establishing two new organisations within the ministry, responsible for internal security and ideological affairs.
Their directors would be appointed directly by Supreme Leader Mojtaba Khamenei, while the intelligence minister would continue to be nominated by the president and approved by parliament.
Goudarzi said the changes would help resolve the leadership vacancy following Khatib's death. The ministry has been run by an acting minister whose identity has not been publicly disclosed.
The proposed legislation has yet to receive parliamentary approval, and it remains unclear whether the eventual selection of a new minister would favour career intelligence officials or figures associated with the Revolutionary Guards.
While the parliamentary proposal would retain the ministry and alter its leadership arrangements, the merger discussion goes further, raising the possibility of consolidating institutions that have operated as competing centres of security authority for decades.
Neither proposal has been adopted, and no decision to merge the intelligence agencies has been announced.