For most IB students, the strongest subject combination for international relations is Global Politics HL, History HL, and Language A HL, supported by a second language, mathematics, and a science at SL. However, there is no universal required combination. Economics, Geography, Philosophy, and a language at HL can all be excellent alternatives, depending on your strengths, school provision, and intended university courses.
The central principle is to take at least one rigorous essay-based subject at HL, demonstrate strong analytical writing, and choose subjects in which you can earn high grades. Universities usually care more about your HL results and overall Diploma score than about finding one supposedly perfect combination.
The best IB subjects for international relations
International relations is interdisciplinary. University courses commonly combine political theory, diplomatic history, international law, economics, security, development, research methods, and regional studies. A good IB combination should therefore build argumentation, evidence evaluation, contextual knowledge, and communication skills.
Global Politics
Global Politics is the most directly relevant IB subject because it examines power, political actors, conflict, rights, justice, development, and sustainability. The current course, first assessed in May 2026, includes a core focused on understanding power and global politics alongside thematic studies in rights and justice, development and sustainability, and peace and conflict.
Taking Global Politics HL signals clear academic interest, but it is not normally an admission requirement. Universities understand that many IB schools do not offer it. Students can review the course through RevisionDojo’s IB Global Politics resources and syllabus-aligned Global Politics notes.
History
History HL is often the strongest alternative or companion to Global Politics. It trains you to interpret sources, compare explanations, construct sustained arguments, and understand how states, conflicts, institutions, and ideologies developed over time.
These skills transfer directly to international relations essays. History is especially useful for degrees with diplomatic history, foreign policy, war studies, or regional specialisms, although universities rarely make it compulsory. RevisionDojo’s IB History resources can help students judge the course’s content and assessment demands.
Economics
Economics HL or SL provides a different but equally valuable perspective. Trade, sanctions, development, debt, inequality, monetary policy, and economic interdependence all shape relationships between states and international institutions.
Economics is particularly useful for political economy, international development, public policy, or combined politics and economics degrees. It also adds quantitative and diagram-based analysis to an otherwise essay-heavy programme. The RevisionDojo explanation of economic power in global politics illustrates this connection.
Languages and Geography
A strong Language A course develops close reading and precise academic writing. A Language B studied to the highest realistic level supports regional expertise, intercultural understanding, and possible future work in diplomacy or international organisations. Language B HL is valuable, but it should not replace a stronger essay-based HL if your target universities prefer one.
Geography is particularly relevant to migration, borders, climate politics, development, population change, resources, and urbanisation. Philosophy can also strengthen conceptual reasoning, while Social and Cultural Anthropology supports the study of identity and culture.
| Subject | Main preparation for international relations | Best suited to students interested in |
|---|---|---|
| Global Politics | Political concepts, case studies, contemporary issues | Diplomacy, security, governance, human rights |
| History | Source analysis, causation, comparison, extended argument | Foreign policy, conflict, diplomatic history |
| Economics | Trade, development, sanctions, quantitative reasoning | Political economy, policy, international development |
| Geography | Spatial analysis, migration, resources, sustainability | Climate politics, development, geopolitics |
| Language A or B | Communication, interpretation, cultural knowledge | Regional studies, diplomacy, international careers |
How the combination fits IB Diploma rules
The official IB Diploma curriculum requires six subjects. Students normally cover studies in language and literature, language acquisition, individuals and societies, sciences, mathematics, and the arts. The arts subject may be replaced by an additional subject from another permitted group, which allows an international relations applicant to take two Individuals and Societies subjects, such as Global Politics and History.
At least three and no more than four subjects are taken at HL. The remaining subjects are taken at SL. HL courses involve greater depth and recommended teaching time, so universities often pay particular attention to the three HL grades.
A typical international relations combination could be:
- HL: Global Politics, History, Language A
- SL: Language B, Biology, Mathematics: Applications and Interpretation
This is a coherent humanities profile, but it is not automatically superior to every alternative. Students should consult RevisionDojo’s guidance on choosing IB Higher Level subjects before committing to three demanding essay subjects.
Strong subject combinations for different interests
Broad international relations preparation
- HL: Global Politics, History, Language A
- SL: Language B, science, mathematics
This offers the clearest preparation for political analysis and academic writing. Its main disadvantage is the concentration of essays and reading across all three HL subjects.
Political economy and development
- HL: Economics, Global Politics or History, Language A
- SL: Language B, science, mathematics
This combination balances qualitative argument with economic analysis. Students considering economics-heavy joint degrees should check whether a university expects a particular mathematics course or level, since requirements for economics can be stricter than those for international relations.
Diplomacy, languages, and regional studies
- HL: History or Global Politics, Language A, Language B
- SL: another Individuals and Societies subject, science, mathematics
This can be excellent for students already proficient in a second language. It demonstrates linguistic depth without sacrificing an essay-based social science.
Environment, migration, and geopolitics
- HL: Geography, Global Politics or History, Language A
- SL: Language B, science or Environmental Systems and Societies where permitted, mathematics
This profile suits climate security, migration, development, and resource politics. The important feature is not the label of each subject but the combination of writing, evidence analysis, and thematic relevance.
What universities actually require
Many international relations degrees do not prescribe specific IB subjects. For 2026 entry, King’s College London lists no required or preferred subjects for its International Relations BA. UCL Politics and International Relations states that no specific subject is required, although an essay-based subject at HL is preferred.
Requirements can be more specific elsewhere. Bristol’s Politics and International Relations course requires an essay-based subject at HL. The LSE International Relations course does not set one fixed combination but values a broad selection of established academic subjects.
These examples show why students must distinguish required, preferred, and merely relevant subjects. A required subject is a formal condition. A preferred subject may strengthen preparation but is not compulsory. Entry scores and policies can change annually, so check each course page before finalising IB choices or applying.
How to choose your final combination
Begin by making a shortlist of five to eight possible university courses across more than one country. Record their total IB score, HL score pattern, required subjects, preferred subjects, mathematics expectations, and language requirements.
Then compare those conditions with your academic strengths. A predicted 7 in History HL usually helps more than choosing Economics HL for appearance and receiving a much lower grade. Select three HLs that are relevant but also manageable alongside the Extended Essay, Theory of Knowledge, internal assessments, and CAS.
If Global Politics is unavailable, do not assume you are disadvantaged. History, Economics, Geography, Philosophy, English, and languages can provide equally credible preparation. RevisionDojo’s article on choosing a Group 3 subject offers a useful comparison of these options.
Common mistakes to avoid
- Choosing subjects only because they sound relevant. Interest matters, but admission offers depend heavily on grades.
- Ignoring formal prerequisites for joint degrees. International relations may require no specific subject, while economics, a language, or data-focused pathways might.
- Taking too many essay-heavy HLs without considering workload. Three simultaneous research and writing courses can create difficult assessment deadlines.
- Assuming Mathematics AI SL is accepted everywhere. It is commonly suitable for international relations, but economics-related degrees may expect stronger mathematics.
- Dropping a language too quickly. Languages are not generally compulsory for admission, yet sustained proficiency can support regional study and future career options.
- Using current affairs as a substitute for academic analysis. Strong applicants connect events to concepts, evidence, institutions, and competing interpretations.
Conclusion
The best subject combination for international relations normally includes Global Politics or History at HL, a strong essay-based language subject, and supporting study in Economics, Geography, or a second language. No single combination guarantees admission, and many universities specify no compulsory subjects. Your aim should be a coherent, academically rigorous programme in which you can achieve strong HL and overall results.
RevisionDojo can support that programme through Global Politics and History Study Notes, Flashcards, Questionbank practice, and Jojo AI. Use those tools to compare course demands and strengthen the analytical writing expected in both IB assessment and university study.
Sources and referenced URLs
- IB Diploma Programme curriculum
- IB Global Politics curriculum update
- King’s College London International Relations requirements
- UCL Politics and International Relations requirements
- University of Bristol Politics and International Relations requirements
- LSE BSc International Relations
- RevisionDojo IB Global Politics resources
- RevisionDojo Global Politics notes
- RevisionDojo IB History resources
- RevisionDojo guide to economic power
- RevisionDojo HL subject selection guide
- RevisionDojo Group 3 subject guide
