It is the first verdict he has received since his ousting and is one of several trials he faces.
Morsi was deposed by the army in July 2013 following mass street protests against his rule.
Since then, the authorities have banned his Muslim Brotherhood movement and arrested thousands of his supporters.
Morsi and 14 other Brotherhood figures escaped a more serious charge of inciting the killing of protesters, which could have carried the death sentence.
Most of the other defendants were also given 20-year prison sentences.
The Muslim Brotherhood movement called on Egyptians to take to the streets and make a massive rally in support of the ex-president.
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