Enas Oun, who is the head of the Monitoring and Documentation Department at the Bahrain Center for Human Rights (BCHR), was stopped at the Bahrain International Airport on Monday morning as she was on her way to a human rights workshop in Tunisia, Arabic-language Lualua television network reported.
Authorities told her that she could not travel abroad based on an order issued by the Criminal Investigation Department the previous day.
Bahrain has been heavily cracking down on political dissent for almost five and a half years.
On August 18, Bahraini officials handed down a three-year prison sentence to human rights activist Ghada Jamshir.
An ardent campaigner for the reform of judicial system in Bahrain and the Arab states of the Persian Gulf, Jamshir was charged with engaging in political activities against the Manama regime, and publishing posts critical of the Al Khalifah dynasty on social media.
Last month, Bahraini officials prevented more than 16 human rights activists from attending the 32nd session of the Human Rights Council, which took place in the Swiss city of Geneva from June 13 to July 8.
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