Akis Tsochatzopoulos, 74, received more than $64 million in bribes and used the money to buy property, prosecutors said.
He oversaw the country's biggest defense procurement program, and the bribes were related to the purchase of Russian missiles and German submarines, The Financial Times reported.
His wife, Vicky, and daughter, Areti, were sentenced to 12 years in prison. His former wife received a prison term of six years.
Thirteen other associates were also jailed, the Times reported.
Tsochatzopoulos, who is already serving an eight-year term for falsifying wealth records while he was a member of parliament, denied the charges during a five-month trial.