Taner Kilic was imprisoned over alleged connections to the Gulen movement, accused by Ankara of an attempted coup.
The arrests of Taner Kilic and 22 other attorneys are part of a crackdown on people suspected of links to U.S.-based cleric Fethullah Gulen
Taner Kilic remanded in custody by court after release of eight other rights activists pending trial in a separate case.
Nephew of the US-based dissident Muslim cleric Muhammed Fethullah Gulen, considered by Ankara to be allegedly behind the coup attempt in Turkey, was taken into custody as a part of the ongoing investigation on Saturday.
Taner Kilic, head of Amnesty International Turkey, has been ordered to stay in pre-trial detention.