A total of 890 arrests were made at the Palestine Action protest in central London yesterday.
The Metropolitan Police confirmed the number, with 17 of those arrested on suspicion of assaulting police officers.
Some 857 people were arrested under the Terrorism Act for showing support for a proscribed group
Thirty-three were arrested for other offences.
The force said those arrested were processed at a prisoner reception point in the Westminster area.
Those whose details could be confirmed were released on bail to appear at a police station at a future date.
Individuals who refused to provide their details or were found to have been arrested while already on bail were taken to custody suites.
The Met's Counter Terrorism Command will investigate the 857 people arrested under the Terrorism Act.
Protests 'turned violent' yesterday in Central London
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Some 17 people were arrested on suspicion of assaulting police officers
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An estimated 1,500 people took part in the protest, with the force condemning the "intolerable" abuse it says its officers suffered.
Campaign group Defend Our Juries (DOJ) said the rally was "the picture of peaceful protest".
Deputy Assistant Commissioner Claire Smart, who led the policing operation, said: "I'd like to thank all officers involved in yesterday’s operation for their professionalism and tireless work despite the level of abuse that they faced.
"The violence we encountered during the operation was coordinated and carried out by a group of people, many wearing masks to conceal their identity, intent on creating as much disorder as possible. Many of those individuals have now been arrested, and we have begun securing charges.
Several protesters held up signs reading 'I oppose genocide - I support Palestine Action'
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Defend Our Juries said the rally was 'the picture of peaceful protest'
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"The contrast between this demonstration and the other protests we policed yesterday, including the Palestine Coalition march attended by around 20,000 people, was stark. You can express your support for a cause without committing an offence under the Terrorism Act or descending into violence and disorder, and many thousands of people do that in London every week.
"We have a duty to enforce the law without fear or favour. If you advertise that you are intending to commit a crime, we have no option but to respond accordingly."
Palestine Action was banned as a terror organisation in July after the organisation claimed responsibility for damage to a pair of Voyager planes at RAF Brize Norton on June 20.
New Home Secretary Shabana Mahmood said she will be "just as tough" as her predecessor, Yvette Cooper, on Palestine Action.
Nearly 900 people were arrested in Central London
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Defence Secretary John Healey said that supporters of the organisation would need to face consequences to avoid "two-tier policing".
Asked whether there would be a shift in Government policy on the group, Mr Healey said: "I expect Shabana Mahmood to be just as tough as Yvette Cooper and I expect her to defend the decision the Government's taken on Palestine Action, because of what some of its members are responsible for and were planning."
The Home Office plans to appeal a High Court ruling that permits Huda Ammori, co-founder of Palestine Action, to challenge the Government's ban on the group.
Ms Ammori's legal action was prompted by the then-home secretary Yvette Cooper's decision to classify the group as a terrorist organisation under anti-terror laws.
This classification made membership in, or support for, the direct action group a criminal offence, punishable by up to 14 years in prison.
Ms Mahmood has not yet commented on the arrests at the protest yesterday.