Aleksander Kwasniewski said that as president he put pressure on the US to end brutal CIA interrogation at the secret prison on Polish soil in 2003.
"I told (then US president George W) Bush that this cooperation must end and it did end," Kwasniewski told local media.
He was speaking a day after the scathing Senate report revealed the CIA had used methods amounting to torture to interrogate prisoners after the September 11, 2001 terror attacks.
Kwasniewski, president between 1995 and 2005, said he raised Polish concerns over CIA activities in Poland face-to-face with Bush at the White House in 2003.
He said Bush insisted that the intelligence agency's methods provided "important benefits in security matters," a claim disputed by the report.
"The Americans conducted their activities in such secrecy, that it raised our concern. Polish authorities acted to end these activities and they were stopped under pressure from Poland."
Kwasniewski said Poland had agreed to "beefed-up intelligence cooperation" with the US within the framework of NATO after the September 11 attacks, but insisted he was unaware that the CIA practised torture at its secret facilities.
Poland allowed the CIA to hold terror suspects on its soil on the condition they were "treated as prisoners of war", he said, adding that the US never signed the memorandum of understanding that included this stipulation.
Those who broke international laws prohibiting torture must be prosecuted, he added.
The European Court of Human Rights slammed Poland in July for complicity in torture on its territory of a Palestinian and a Saudi, later sent to the notorious US Guantanamo Bay base.
The court concluded Poland had cooperated in the CIA's notorious "rendition" programme.
The CIA disputes the findings of the Senate report, which says 119 detainees were captured and imprisoned in secret CIA "black sites" in countries whose names were redacted.
Previous news reports suggested the sites were located in Afghanistan, Lithuania, Poland, Romania, and Thailand.
Polish prosecutors have been probing allegations of the secret prison since 2008. They said they will ask for access to the damning report.
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