The news comes one month after a judge listed the group’s armed wing as a terrorist group.
While the January decision on Hamas targeted only the armed wing, Saturday’s broader ruling could further deteriorate relations between Cairo and Hamas which controls the Palestinian Gaza Strip.
The ruling came in response to a lawsuit alleging that Hamas was involved in attacks in Egypt in recent months.
Hamas has persistently denied any meddling in Egypt’s affairs.
Relations between Egypt and Hamas, an offshoot of the Muslim Brotherhood, have deteriorated since President Mohammed Morsi, a senior Brotherhood leader, was overthrown in 2013.
Egypt has already listed the Brotherhood as a terrorist organization.