The court also sentenced two children to 10 years in prison. Four of the 15 defendants were sentenced in absentia.
The defendants were found guilty of committing violent acts, killing two civilians and demolishing public buildings.
The incident dates back to December 2013 when members of Muslim Brotherhood clashed with Egyptian police officials in Geish and el-Madina el-Monawara streets of Suez city.
In October last year, President Abdel Fattah al-Sisi issued a new law expanding the jurisdiction of military tribunals on civilians, allowing the referral of crimes committed against the state's public and "vital" facilities to the military judiciary.
In April, an Egyptian criminal court sentenced ousted president Mohamed Morsi and 12 other Muslim Brotherhood leaders for 20 years in prison for inciting violence near the Ittihadeya presidential palace in 2012.
