The Initiative for Parliamentary and Diplomatic Engagement was endorsed, at the time of its founding, by the following former prime ministers, deputy prime ministers, foreign ministers, cabinet ministers, party leaders, ambassadors, provincial premiers, as well as business leaders and organizations that promote the best in political and public life.
- Hon. Perrin Beatty, former secretary of state for external affairs; former president and CEO of the Canadian Broadcasting Corporation
- Hon. Ed Broadbent, former member of Parliament; former leader of the federal New Democratic Party
- Derek Burney, former chief of staff to prime minister Brian Mulroney; former ambassador to Korea and the United States
- Right Hon. Kim Campbell, former prime minister of Canada
- Right Hon. Jean Chrétien, former prime minister of Canada
- Right Hon. Joe Clark, former prime minister of Canada
- Thomas d’Aquino, former president and CEO of the Canadian Council of Chief Executives
- Hon. John Manley, former deputy prime minister and minister of foreign affairs; current president and CEO of the Canadian Council of Chief Executives
- Preston Manning, former leader of the official opposition
- Alexa McDonough, former member of Parliament; former leader of the federal New Democratic Party
- Hon. Frank McKenna, former premier of New Brunswick; former Canadian ambassador to the United States
- Hon. Anne McClellan, former deputy prime minister
- Hon. Peter Milliken, former speaker of the House of Commons
- Right Hon. Brian Mulroney, former prime minister of Canada
- Hon. David Peterson, former premier of Ontario
- Hon. Michael Wilson, former minister of international trade; former Canadian ambassador to the United States
- Canadian Association of Former Parliamentarians, dedicated to strengthening the institutions of democracy and public participation in the political process in Canada and abroad
- Canadian Defence and Foreign Affairs Institute, an independent research institute with an emphasis on Canadian foreign policy, defence policy and international aid
- Equal Voice, promoting the election of women in Canada
- Ottawa Diplomatic Association, helps provide social and networking opportunities for international diplomatic agents and organizations
- Public Policy Forum, dedicated to improving the quality of government in Canada through dialogue among the public, private and voluntary sectors
- Parliamentary Centre, devoted to improving the effectiveness
of representative assemblies around the world - Samara, studies citizen engagement with Canadian democracy