Sadiq Khan has written to Home Secretary Sajid Javid, urging him to ban the political wing of Hezbollah ahead of this weekend's Al Quds Day parade where people wave the group's flag.
The London Mayor has urged Mr Javid to close a legal loophole that means people can fly the terror group's flag on so-called "political grounds", because Hezbollah's military wing is proscribed as a terrorist group in Britain but its political wing is not.
Last year, the Hezbollah flag, which depicts an AK-47 assault rifle, was a common sight at the annual Al Quds Day parade in London. The next parade is on Sunday.
The mayor's spokesperson told the JC: "Anti-Semitism or hate crime of any kind has no place in our city or in our society.