Ahmed Nazif, whom Mubarak sidelined to appease protesters during the 2011 uprising that ended his rule, was convicted in his retrial of having used his position to make a fortune of USD 8.2 million (7.5 million euros).
The court also fined him USD 6.8 million.
Nazif had been accused of corrupt real estate deals and receiving illegal bonuses.
Mubarak and many of his former ministers were placed on trial following his overthrow amid popular demands to hold them accountable for years of corruption.
Mubarak and his two sons were sentenced to three years in prison earlier this year for corruption.
But they had been in detention for much of the past four years, and may be released early when time served is accounted for.