Public Policy

Government of Canada: The Federal Student Work Experience Program (FSWEP) provides full-time students with the opportunity to explore their interests and develop their skills.
https://www.canada.ca/en/public-service-commission/jobs/services/recruitment/students/federal-student-work-program.html

Government of Ontario: Every year, the Ontario Public Service, related agencies and community groups, provide 5,000 students with jobs across the province. These jobs help Ontario students with limited work experience develop transferable skills, support their career goals and learn more about the Ontario Public Service. Explore policy related jobs available through Ontario Public Service Summer Student Program.
https://www.gojobs.gov.on.ca/Pages/SEP.aspx

Government of Canada National Research Council: Develop your research skills vital for Policy work. The National Research Council (NRC) Student Employment Program provides students with practical career-related experience in research and development, library sciences, communications, marketing and other areas.
https://nrc.canada.ca/en/corporate/careers/nrc-student-employment-program

Toronto Youth Cabinet: Established in 1998 by Toronto City Council, The Toronto Youth Cabinet is the official youth advisory body to the City of Toronto. The Toronto Youth Cabinet (TYC) is a youth-led advocacy group that promotes youth participation in civic affairs. The TYC advocates on youth issues with various youth organizations across the city, and promotes youth involvement in policy development.
https://www.toronto.ca/311/knowledgebase/kb/docs/articles/social-development,-finance-and-administration/community-resources/toronto-youth-cabinet-tyc-role.html

Government of Canada National Defense and Armed Forces: The Policy Officer Recruitment Programme - or PORP - is a three-year programme created to recruit, develop, and train talented individuals from entry to working-level in the Policy Group at the Department of National Defence. Working as a student for the Department of National Defence (DND) offers practical work experience to complement your education, and is a great opportunity to kick-start your career in the public service.
http://www.forces.gc.ca/en/jobs-civilian/students-new-grads.page

United Nations Association in Canada: In celebration of Canada’s sesquicentennial, the United Nations Association in Canada in partnership with the British Council Canada is proud to launch Active Citizens Social Enterprise (ACSE) in communities across the country. ACSE is a social leadership training programme that provides opportunity to young Canadians from diverse backgrounds, between 18-35 years of age, to learn about and experiment with social innovation through intercultural dialogue and community-led social development.  Recruited youth will gains skills to tackle local challenges that align with established Sustainable Development Goals (SDGs) targets.
http://www.unac.org/volunteer

The NATO Association of Canada provides a forum for Canadians to learn about and discuss Canada’s role in NATO and our contribution to international trade, peace, and security. The Association offers unpaid internship opportunities for young Canadians between the ages of 18 and 30.
http://natoassociation.ca/internship/

The Council of the Federation: The purpose of the Youth Internship Program is to encourage young Canadians to more actively participate in public policy development, public service, government and political life.
https://www.canadaspremiers.ca/youth-internship-program/

The Association of American Universities (AAU) offers undergraduate unpaid internships for the spring, summer, and fall semesters. The focus of the internships is on science and higher education policy.
http://politics.utoronto.ca/wp-content/uploads/2014/07/AAU-Internship.pdf

The Bard Center for Civic Engagement plays a central role in assisting students in securing internships and providing other opportunities to learn and grow. CCE coordinates with numerous partners on campus, and an array of off-campus programs both stateside and abroad, featuring numerous internship opportunities. Additionally, CCE spearheads the Community Action Awards. These awards provide funding for more than 50 students annually who are pursuing pre-professional experience and community action projects that address issues related to the field of civic engagement. 
https://www.bard.edu/academics/additional/

The Centre on Global Health Security periodically offers opportunities for students and graduates in public health, international relations, development studies, or a related field, and a demonstrated interest in global health who would like to gain valuable work experience in a policy institute. 
https://www.chathamhouse.org/about-us/our-departments/global-health-programme

North Atlantic Treasury Organization: There are two types of Internship opportunities at the Alliance: the NATO-Funded and the GRANT-funded Internship Programme. The NATO-funded Internship Programme gives opportunity to a wide range of candidates, while the other opportunity is open for those, whose work is supported from outside sources. And while Candidates interested in a GRANT-funded opportunity can apply throughout the year, the call for the NATO-funded opportunity is open only once per year in Spring.
http://www.nato.int/cps/en/natolive/71157.htm

The International Center for Human Development regularly seeks interns to assist staff with ongoing projects in its office in Yerevan. ICHD’s Internship Program offers career-related work experience to students and other individuals interested in volunteering. Internships are set up on quarterly or a semester basis, but may be extended. Interns do not receive a fixed stipend. Upon successful completion of the internship, ICHD will provide interns with a certificate of appreciation and reference letter upon request.
https://ichd.org/?laid=1&com=module&module=menu&id=27

Sandra Rotman Centre: Gain meaningful, hands-on experience in the diverse, interdisciplinary field of global health through Grand Challenges Canada’s Summer Student program. Each summer, Grand Challenges Canada welcomes passionate and driven students from a variety of disciplines to work as part of our team, through the Summer Student Program.
http://www.srcglobal.org/careers/

Amnesty International Canada offers occasional internship opportunities for students and recent graduates in London UK, and domestically in Ottawa, Toronto, Halifax and Vancouver. Amnesty International is a non-governmental organization focused on human rights focused on research and generating action to prevent and end grave abuses of human rights, and to demand justice for those whose rights have been violated.
http://www.amnesty.ca/about-us/work-with-us