The Charity Commission received complaints about several aspects of the poverty relief charity's campaign, including one from shadow transport secretary Theresa Villiers.
A commission spokesman said it had dismissed most of the complaints, but added: "We have reminded War on Want a charity may only engage in campaigning and political activity that is directly related to its charitable purposes. We've also had written assurance from the trustees that they will review their strategy."
John Hilary, campaigns and policy director at the charity, said: "We are fully aware of commission guidelines and will take them into account. We will continue to work for an end to the humanitarian crisis facing the Palestinian people."