03/01/2025
IDEA/CIMUN Staff Alumni Get together
Find out more about the Spring All Staff Alumni, friends and family gathering, coming soon to a rooftop in Chicago this spring.
December 4-7, 2025
Fairmont Chicago Millennium Park
It's your world.
Fix it.
Welcome to CIMUN 2025 - Chicago's premier Model UN experience where high school delegates tackle global challenges through innovative diplomacy, realistic portrayal of national interest, and strategic problem-solving.
The 22nd annual Chicago International Model UN (CIMUN) features our unique simulation style that mirrors real-world international relations, developed by the Institute for Diplomacy Education and Advocacy (IDEA).
December 4-7, 2025
Fairmont Chicago Millennium Park
200 N Columbus Dr, Chicago, Illinois
What Sets CIMUN Apart
CIMUN delivers an unparalleled educational experience that transforms how students understand global politics and diplomacy.
Real-World Diplomatic Challenges
Our conferences mirror actual international relations dynamics, preparing delegates for future leadership roles while building crucial skills in negotiation, public speaking, and strategic thinking.
Experience Diplomatic Interconnection
Unlike traditional Model UN conferences, CIMUN features fully integrated committees where actions in one body directly impact others. Delegates must collaborate as country teams to advance their national interests across multiple fronts simultaneously.
Our unique awards system recognizes both diplomatic expertise and political innovation, rewarding delegates who master their country's position while demonstrating adaptability in complex scenarios.
Dynamic Crisis Simulations That Evolve in Real-Time
Our dedicated crisis staff creates breaking developments throughout the conference, challenging delegates to respond to unexpected events just as real diplomats must do.
CIMUN 2025 Spotlight:
This year features our most ambitious integrated simulation yet, including our acclaimed Historical Simulation set in 1956. Delegates will navigate complex geopolitical challenges in a unique historical context.
Opening Ceremonies & Banquet
Begin your CIMUN experience with our elegant opening plated banquet featuring distinguished speakers from diplomatic and international affairs backgrounds. This formal plated dinner provides delegates the perfect opportunity to network with peers and faculty while setting the professional tone for the conference.
CIMUN 2025 Featured Committees
Historical Simulation: 1956
Step back to 1956 where delegates will navigate the complex diplomatic landscape of the Suez Canal Crisis. This simulation challenges participants to rewrite history through strategic diplomacy and coalition-building
Explore all Committees
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It's your world. Fix it.
Welcome to the 22nd annual Chicago International Model UN. CIMUN features the unique Model UN style developed by the Institute for Diplomacy Education and Advocacy (IDEA).
Join Our Elite Team
CIMUN staff members represent the best of the Model UN community - diverse university students and young professionals passionate about creating exceptional educational experiences.
Historical Simulation: 1956
University students and graduates: Apply to join our committee, simulations (crisis), and administrative teams.
Technology-Enhanced Diplomacy
CIMUN News Network: Daily video broadcasts covering conference developments
Interactive Crisis Updates: Real-time information delivery to committees
"Alive and breathing comes to mind... The strength of this conference is the cross simulation crisis. Very real life."
Linda Bowman-Jones
Edens Senior High School (Edens, NY)
"We go to 8 conferences, CIMUN is the best!"
Diane Haleas
St. Ignatius College Prep (Chicago, IL)
"[IDEA] created a Model UN conference that keeps delegates and advisors coming back for more."
Best Delegate.Com
"Inspiring kids to care about their world."
Gwyneth Connel
Millbrook School, (Millbrook, NY)
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The Patricia Leahy Fellowship for Educators
This prestigious fellowship honors exceptional Model UN faculty advisors with professional development support and a generous cash stipend. Named for Patricia Leahy, beloved Model UN Advisor at Hinsdale South High School, this program recognizes educators who demonstrate outstanding commitment to Model UN education.
Apply
Upcoming Events & News
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01/04/2025
Best MUN conferences in Chicago
What are the best Model UN conferences in Chicago? Click here to find out more
05/04/2025
CIMUN Style Simulation
Learn more about our unique Model UN simulation style that emphasizes realistic portrayal of national interest and a fully-integrated simulation environment.
Ready to Experience CIMUN?
Join hundreds of passionate delegates from across the world for four days of diplomatic immersion, skill-building, and unforgettable connections.