Poroshenko, who is a close political ally of President Viktor Yushchenko, was removed from office in September after presidential aide Oleskandr Zinchenko and former Security Minister Oleksandr Turchynov accused him of corruption.
But the parliamentary commission ruled yesterday that neither Zinchenko or Turchynov has produced enough evidence to sustain their accusations.
Ukraine's former prosecutor-general, Svyatoslav Piskun, claims that Yushchenko sacked him in October because he had launched a criminal probe into Poroshenko.
2005 In Pictures
A slideshow of images related to the top news stories of 2005.