While various top commanders and political leaders have long been blamed for the Islamic State (IS) jihadist group's disastrous takeover of the capital of Nineveh province, the investigative committee's report is the first time they have been named officially.
Committee member MP Abdulrahim al-Shammari said that Maliki, who was prime minister from 2006 until last year, was among those named, as did another member who declined to be identified.
The inclusion of Maliki's name - who is now vice president - was a source of controversy on the committee, with his Dawa party pushing for it to be left out.
An MP on the committee said these include defence minister Saadun al-Dulaimi, army chief of staff Babaker Zebari, his deputy Aboud Qanbar, ground forces commander Ali Ghaidan, Nineveh operations command chief Mahdi al-Gharawi and the province's governor, Atheel al-Nujaifi.
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The report was presented today to parliament speaker Salim al-Juburi, who said it will be sent to the prosecutor general for legal action.
"No one is above the law and the questioning of the people, and the judiciary will punish those" responsible, Juburi said in a statement.
Multiple Iraqi divisions collapsed during the initial assault in the north, in some cases abandoning weapons and other equipment which the jihadists then used to further their drive.
Maliki is widely viewed as having exacerbated sectarian tensions between the country's Shiite majority and its Sunni Arab minority.
Widespread discontent among Sunni Arabs, who say they were marginalised and targeted by Maliki's government, played a major role in aggravating the security situation in Iraq, culminating in the jihadist rout.