The 6 October Misdemeanour Court on Wednesday fined television host Jihan Mansour LE10,000 for "insulting" and "defaming" Essam El-Erian, vice president of the Muslim Brotherhood's Freedom and Justice Party.
The court ordered Mansour to pay LE10,000 in "compensation" to the veteran Muslim Brotherhood member.
Last October, El-Erian accused the Dream TV host of taking money to insult him and the Brotherhood on her television programme.
The crisis with Mansour began last year when she produced an episode of her show, Sabahak Ya Masr ('Good Morning Egypt'), following clashes in Tahrir Square during which Brotherhood members reportedly attacked anti-government protesters.
El-Erian called the show on air to comment on the accusations, asserting that Mansour had been paid to attack the Islamist group.
In the same show, Mansour threatened to take legal action against El-Erian, accusing the leading Brotherhood figure of speaking to her in "an unprofessional manner."