The protesters called for an end to the fighting, the implementation of a resolution to the conflict between Israel and Hamas, an exchange of hostages and an end to the siege imposed by Israel on the Palestinian enclave.
Carrying banners with slogans such as Jews against genocide, End the occupation and This Jew for a ceasefire, they expressed their disagreement in English and Hebrew.
The demonstration, in which people from different backgrounds participated, reflected a wide range of voices within the Jewish community, according to the source.
Zionism harms all Jews, said Jeffrey Newman, rabbi of the Finchley Reform Synagogue, who addressed the crowd.
For me it is an outrage, a blasphemy in the name of God, that we have to express the need for humanitarian aid for the people of Gaza, and I have been a fierce critic since 1967 of the policies of Israel, government and especially at work, he added.
According to him, what God requires of us is to do justice, love mercy, and walk humbly.
For his part, the deputy leader of the Green Party, Zack Polanski, who shares Jewish heritage, said that violence causes more violence.
According to him, Zionism harms all Jews, because it is based on a wrong understanding of the meaning of security.
No Jew is safe in Israel if there is apartheid, and no Jew is safe anywhere in the world if there is a separatist state that claims to be there for their safety, he said.
Protesters also observed a moment of silence in honor of the Israelis and Palestinians who lost their lives since October 7.