Hundreds of demonstrators gathered in central London on Saturday, 21 March 2026, to protest against recent US and Israeli military strikes targeting Iran. The event, organised by the Stop the War Coalition in coordination with other groups including the Campaign for Nuclear Disarmament and the Palestine Solidarity Campaign, formed part of a nationwide day of action.
The march proceeded from Russell Square to Whitehall, concluding with a rally outside Downing Street. Organisers and independent observers estimated the London turnout at several hundred participants. Similar but smaller gatherings took place in Manchester, Birmingham, Cardiff and west Cornwall on the same day.
Protesters displayed numerous banners and placards with direct messages such as “Stop Trump’s wars”, “Tell Starmer: stop arming Israel”, “End nuclear hypocrisy” and “Stop bombing Iran”. Many participants chanted slogans calling for an immediate halt to military operations and a fundamental change in UK foreign policy. Iranian and Palestinian flags were visible throughout the procession, which remained peaceful and orderly under police supervision.
Addressing the crowd in Whitehall, Shabbir Lakha, national officer of the Stop the War Coalition, condemned the strikes. He stated that civilians in Iran, Palestine and Lebanon were “marking Eid under the hail of American and Israeli bombs next to the rubble of their homes and the graves of their loved ones”. Lakha urged the UK government to break from what he described as support for US President Donald Trump’s foreign policy and criticised Prime Minister Keir Starmer for allegedly allowing British facilities to be used in the conflict.
The demonstration occurred against the backdrop of intensified military actions in the Middle East. Since late February 2026, US and Israeli forces have conducted airstrikes on Iranian military and nuclear-related infrastructure amid ongoing disputes over Iran’s nuclear programme and its regional activities. Iranian authorities have responded with retaliatory measures, raising concerns about potential wider escalation involving Lebanon, Gaza and Gulf security.
The United Kingdom’s position has drawn particular criticism from the protesters. Although the British government has publicly called for de-escalation and diplomatic engagement, opponents accuse it of indirect complicity through continued arms exports to Israel and permitting US access to UK military bases.
This London march followed an earlier, larger protest on 7 March 2026 that attracted several thousand people marching to the US Embassy. Both events reflect growing public unease over the humanitarian impact of the conflict, risks to regional stability and potential effects on global energy markets.
A smaller counter-demonstration took place near the Iranian Embassy in Kensington. Fewer than one hundred individuals expressed support for the US and Israeli operations, criticising the Iranian regime and displaying banners in appreciation of actions taken by President Trump and Israeli Prime Minister Benjamin Netanyahu.
The Stop the War Coalition and its partners have positioned the protests as a demand for peaceful, diplomatic solutions based on international law. They continue to call on the UK government to refrain from any further involvement and to prioritise multilateral negotiations.
As military and diplomatic developments unfold in the Middle East, these demonstrations illustrate persistent divisions in British public opinion regarding foreign policy in the region. Organisers have signalled intentions to hold additional actions should the strikes continue, while authorities maintained a visible presence to ensure the safety of all participants and the public.
The events highlight the complex interplay between national security concerns, questions of sovereignty and the humanitarian consequences of military intervention in contemporary international relations.