The accused, who include the director of Amnesty Turkey Idil Eser, several prominent Turkish rights activists and a German citizen and Swedish citizen, have been charged with "giving help to an armed terror group", the Dogan news agency said.
Prosecutors have asked for jail sentences of 7.5 to 15 years, Dogan said, without specifying the request for each suspect.
In the indictment, the activists are accused of seeking to create "chaos in society" similar to the anti-government protests that rocked Turkey in the summer of 2013.
Their jailing sparked international alarm and amplified fears of declining freedom of expression under President Recep Tayyip Erdogan.
A month before, Amnesty International's Turkey chair, Taner Kilic, was remanded in custody on charges of links to the alleged mastermind of the July 15 failed coup Fethullah Gulen.
His case has now been merged with that of the other ten activists and faces even more serious charges of "membership" of an armed terror group.
This has stoked tensions in particular with Berlin, whose relations with Ankara have plunged as Germany sharply criticised the mass crackdown that followed last year's failed coup.
Amnesty describes Gharavi as an IT strategy consultant and Steudtner as a "non-violence and well-being trainer".
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