Figures from the Met covering London show that 218 antisemitic offences were recorded from 1 October to 18 October this year, compared with 15 in the same period last year.
Both Jewish and Muslim communities have previously complained of feeling underprotected from hate crimes.
Police said they made 21 arrests in the first 18 days of October, in just under 7% of cases, with investigations continuing into others.
Police said a man was arrested for 10 alleged incidents of Islamophobic graffiti at bus stops in New Malden and Raynes Park, south London.
More protests are scheduled this week over the Israel-Hamas war, with police trying to navigate their way through a series of tense disputes.
Some say it is calling for the destruction of Israel and thus is automatically antisemitic, while others say it is merely calling for Palestinian self-determination.
Discussions between police commanders and prosecutors have been held to seek clarity about when it could be an offence. »
