The trial of Pamuk, Turkey's most famous writer, which began last month, had been adjourned pending a decision by the justice ministry, whose authorization was needed to continue the case.
CNN-Turk said the ministry had declared in a letter to the tribunal that it was legally not competent to judge whether the case should go on, and the court had thus decided to dismiss the case.
A justice ministry official declined any immediate comment on news of the court's decision but said the ministry would address the issue later.
Pamuk, who has won several international literary prizes, risked up to three years in prison for remarks made during an interview published in a Swiss magazine last February.
"One million Armenians and 30,000 Kurds were killed in these lands and nobody but me dares talk about it," he told Das Magazin in February.
Turkey categorically denies Armenian accusations that up to 1.5 million of their kinsmen died in a genocide orchestrated by the Ottoman Empire between 1915 and 1917.
The case against Pamuk, praised by Turkish nationalists, drew condemnations from the European Union, which warned it was a test of freedom of speech in Turkey.
Some EU lawmakers who attended the December hearing said the trial could affect the country's aspirations to join the bloc.
Pamuk's lawyer could not be reached to confirm the television report. The trial had been set to resume on February 7.