The Islamist Istiqlal party has been banned over its participation in the Muslim Brotherhood-led National Alliance to Support Legitimacy (NASL), Al-Ahram Arabic news website reported.
The Court for Urgent Matters made the ruling on Monday.
Party leader Magdy Hussein was arrested in July and remains in detention on charges of joining a terrorist group.
A news website close to the party said his health has been deteriorating in detention.
Since Morsi's removal from the presidency last summer, thousands of his supporters have been arrested and tried on a variety of charges, including the top leadership of his Brotherhood group.
The Brotherhood is officially banned and designated as a terrorist group by the authorities.
The NASL is comprised of a number of Islamist parties and has been acting as the body representative of the Brotherhood since the disbanding of the group and its Freedom and Justice Party.
