The majority of the arrests took place in East al-Quds and al-Khalil, which is situated in the south of the West Bank, the NGO, based in Ramallah, said in a statement on Saturday.
Many were arrested during demonstrations in support of Palestinians in Gaza, which was the focus of a deadly 50-day war between Israel and Hamas, the de facto ruler of Gaza.
Since the June kidnapping and murder of three Israeli teenagers in the southern West Bank, at least 2,000 Palestinians have been questioned and detained, according to the NGO.
NTJ/NJF