This decision follows a review by shadow attorney general Baron Wolfson, which found ECHR membership limits the government's ability to address immigration and other policy areas.
Kemi Badenoch, the party leader, is expected to formally announce the move at the upcoming party conference, stating it is necessary to protect Britain's borders, veterans, and citizens.
Lord Wolfson, while confirming the legal and practical feasibility of withdrawal, cautioned that it would not be a complete solution to all issues.
Opposition parties, including Labour, the Liberal Democrats, and Reform UK, have criticised the proposal, questioning its effectiveness and Kemi Badenoch's leadership.