Choosing the right international curriculum is one of the most consequential decisions a school owner or parent can make. Among the many options available today, the Ontario Secondary School Diploma (OSSD) programme stands out for its well-rounded course structure, emphasis on higher-order thinking skills, and global university recognition.
But what exactly are the Canadian curriculum subjects that students follow under this system? This guide provides a comprehensive look at Ontario curriculum subjects, from mandatory core courses to flexible electives, and explains how the right subject selection can open doors to top universities worldwide.
Whether you are a school leader exploring an international programme partnership or a parent evaluating the best academic path for your child, understanding what subjects are in the Canadian curriculum is an essential first step.
Core Subjects: English, Mathematics, Science, Canadian History, and French
The foundation of every OSSD programme is built on a set of compulsory subjects. These core courses ensure that every student graduates with a strong, well-balanced academic profile. To earn the Ontario Secondary School Diploma, students are required to complete 30 credits in total, which include 18 compulsory credits alongside 12 optional credits.
Here is a closer look at the major compulsory Canadian high school subjects:
English (4 Credits)
English is the single most credit-intensive subject in the OSSD framework. Students take one English credit in each grade, from Grade 9 through Grade 12. The programme emphasises critical literacy, written communication, media analysis, and the study of diverse literary works. Grade 12 University-level English (ENG4U) is a prerequisite for virtually every university programme in Canada and abroad.
Mathematics (3 Credits)
Students earn a minimum of three mathematics credits, with at least one at the senior level (Grade 11 or 12). The curriculum progresses from foundational concepts in Grade 9 to advanced courses such as Advanced Functions and Calculus and Vectors at the senior level. These courses are essential prerequisites for university programmes in engineering, computer science, business, and the natural sciences.
Science (2 Credits)
Two compulsory science credits introduce students to biology, chemistry, and physics through an integrated approach in the junior grades. At the senior level, students can pursue individual science disciplines at the University preparation level. Courses like Biology 4U, Chemistry 4U, and Physics 4U are commonly required for admission to competitive university programmes in health sciences, engineering, and environmental studies.
Canadian History (1 Credit)
A compulsory credit in Canadian history, typically completed in Grade 10, provides students with a strong understanding of Canada’s social, political, and cultural development. This course promotes critical analysis of historical events, perspectives, and primary sources. Canadian Geography is also a compulsory requirement, completed in Grade 9, which rounds out the Canadian and World Studies component of the curriculum.
French as a Second Language (1 Credit)
Reflecting Canada’s official bilingual identity, one credit in French as a second language is required for graduation. This course develops foundational listening, speaking, reading, and writing skills. Students who wish to pursue further language study can take additional French credits or other world language courses as electives.
Beyond these five pillars, the OSSD also requires one credit each in the Arts (visual arts, music, drama, or media arts), Health and Physical Education, as well as half-credits in Civics and Career Studies. These additional compulsory courses contribute to a holistic educational experience that prepares students for both academic and personal success.
Elective Subjects: Business, Arts, Technology, Social Sciences, and More
One of the defining strengths of the Ontario curriculum is the breadth of elective options available to students. The 12 optional credits allow students to explore personal interests, develop specialised skills, and build a course profile that aligns with their university and career aspirations.
Popular elective categories within Canadian high school subjects include:
Business Studies
Courses in accounting, marketing, entrepreneurship, and international business give students practical knowledge of the commercial world. These electives are ideal for students interested in commerce, management, or starting their own ventures after graduation.
The Arts
Beyond the compulsory arts credit, students can pursue advanced courses in visual arts, music, drama, and media arts. Rosedale’s Transformative OSSD Curriculum, for example, offers innovative specialty courses in media arts that prepare students for careers in high-growth creative industries.
Technological Education
Technology courses cover a range of disciplines, from computer science and information technology to communications technology and design. These courses develop digital literacy and problem-solving skills that are increasingly valued across all sectors.
Social Sciences and Humanities
Electives in psychology, sociology, philosophy, world religions, and family studies allow students to explore the human experience from multiple perspectives. These courses are excellent preparation for university programmes in the social sciences, education, and law.
Additional Language Courses
Students who wish to develop multilingual competence can pursue additional credits in French, Spanish, or other world languages offered by their school. Language proficiency is a significant asset for students aiming to study or work internationally.
The flexibility of elective options means that no two students follow an identical path. This personalised approach is central to the philosophy behind Ontario curriculum subjects and is one of the reasons the OSSD is valued by universities around the world.
How Subject Selection Affects University Admission and Programme Eligibility
Understanding the connection between high school subject selection and university admission requirements is critical for both school owners offering the OSSD programme and parents guiding their children.
Canadian and international universities typically require applicants to present a minimum of six Grade 12 University (4U) or University/College (4M) level courses. However, specific programme prerequisites vary significantly depending on the field of study.
For example, admission to engineering programmes at institutions such as the University of Waterloo generally requires Advanced Functions (MHF4U), Calculus and Vectors (MCV4U), Physics (SPH4U), Chemistry (SCH4U), and Grade 12 English (ENG4U). In contrast, applicants to social science programmes may only need Grade 12 English as a specific prerequisite, with broader flexibility in their remaining course selections.
This is why strategic course planning from Grade 9 onward is so important. Students who take Academic or University preparation courses throughout high school keep the widest range of post-secondary options available. Schools that offer the OSSD programme play a vital role in providing guidance counselling that helps students align their course selections with their Individual Growth Plans and university ambitions.
The OSSD’s globally recognised diploma also benefits students applying to universities outside of Canada. Graduates can apply directly to institutions in the United Kingdom, Australia, the United States, and across Asia without the need for additional standardised testing, giving them a clear advantage in the international admissions process.
Frequently Asked Questions About Canadian Curriculum Subjects
What subjects are in the Canadian curriculum under the OSSD?
The OSSD requires compulsory courses in English, Mathematics, Science, French, Canadian History, Canadian Geography, the Arts, Health and Physical Education, Civics, and Career Studies. Students also choose 12 elective credits from diverse subject areas including Business, Technology, Social Sciences, and the Arts.
How many credits do students need to graduate with an OSSD?
Students must earn a total of 30 credits, complete 40 hours of community involvement, and meet the provincial literacy requirement through the Ontario Secondary School Literacy Test (OSSLT) or the Ontario Secondary School Literacy Course (OLC4O).
Is the OSSD recognised by universities internationally?
Yes. The OSSD is one of the most widely recognised secondary school diplomas in the world. It is accepted by universities across Canada, the United Kingdom, Australia, the United States, Asia, and beyond. Rosedale Global High School graduates, for instance, received over 4,400 university offers in 2024, including admissions to institutions such as the National University of Singapore, the University of Edinburgh, and Imperial College London.
Can schools outside Canada offer the OSSD?
Yes. Through partnership models such as those offered by Rosedale International Education, schools worldwide can deliver Ontario curriculum subjects to their students. Rosedale currently partners with over 95 schools across more than 17 countries, providing curriculum, digital learning platforms, centralised academic administration, and comprehensive teacher development.
How does the OSSD compare to other international curricula?
The OSSD distinguishes itself through differentiated instruction, progressive evaluation methods, and a strong emphasis on higher-order thinking skills. Unlike programmes that rely on standardised final examinations, the OSSD uses a progressive evaluation model where coursework constitutes a significant portion of the final grade, giving students multiple opportunities to demonstrate their learning throughout each course.
Partner with Rosedale to Bring the OSSD to Your School
For school owners seeking a globally recognised programme that prioritises academic excellence and student development, the OSSD delivered through Rosedale International Education offers a proven path forward. With 59 university-bound courses, a research-based Transformative Curriculum, and centralised quality assurance managed from Toronto, Rosedale empowers international partner schools to deliver world-class education locally.
Parents exploring the best academic opportunities for their children can be confident that the Canadian curriculum subjects offered through Rosedale prepare students not only for university admission but for lifelong success. Contact the Rosedale team to begin your school partnership conversation.
