They were convicted of charges including murdering a policeman and attacks on people and property. The group is among some 1,200 Muslim Brotherhood supporters on trial, including senior members.
Authorities have cracked down harshly on Islamists since Mr Morsi was removed by the military in July. Hundreds have been killed and thousands arrested.
They are expected to appeal. The verdict now goes to Egypt’s supreme religious authority, the Grand Mufti (a senior Islamic scholar), for approval or rejection, says the BBC’s Orla Guerin in Cairo.
Campaigners say that while death sentences are often handed down in Egypt, few have been carried out in recent years.
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