The four academics were among a group of more than 1,000 scholars who in January signed a declaration critical of the government's military operations against Kurdish rebels. The declaration angered President Recep Tayyip Erdogan and led to legal proceedings against some.
They were arrested after holding a news conference in March during which they stood by the declaration. The prosecutor said that the academics should be released and tried under an article of the Turkish penal code which makes it illegal to insult the Turkish state, government, people, parliament, judiciary or security forces, according to local media reports.
The court granted the request for the four to be released, according to the state-run Anadolu Agency. The defendants - Esra Mungan, Muzaffer Kaya, Kivanc Ersoy and Meral Camci - had been held in a high-security prison in Istanbul since their arrest.
In a separate courtroom today, a closed-door trial resumed for two prominent opposition journalists who are accused of espionage and aiding a terrorist organization for their reports on alleged government arms-smuggling to Syria.
Protesters carried signs calling for an end to "dictatorships in university."
The controversial trials come weeks after Erdogan called for a broader legal definition of "terrorism" and "terrorist" to include activists, journalists and legislators who voice support for terrorism organizations.