- Cigarettes
- Cikr
- Cinemas
- Cinematography
- Circuit Breakers
- Circulatory System
- Circuses
- Cis
- Citations
- Cities
- Citizen Academies
- Citizens
- City Government
- City Managers
- City Planning
- Civil Defence
- Civil Defense
- Civil Disturbances
- Civil Engineering
- Civil Rights
- Civilians
- Clandestine Drug Laboratories
- Class A Foams
- Class B Foams
- Claustrophobia
- Cleanup Operations
- Cleveland Clinic Fire
- Climate change
- Climates
- Close Calls
- Clothes Dryers
- Clothing
- Cloud Seeding
- Clouds
- Clowns
- CO2
- Coal
- Coal Mines
- Coalitions
- Coastal Zone Management
- Coastal Zones
- Coatings
- Cocoanut Grove
- Code Administration
- Code Enforcement
- Codes
- Cog
- Cold
- Collaboration
- Collectibles
- Collective Bargaining
- Collective Behavior
- Colleges
- Color Coding
- Color Guards
- Color Visibility
- Columbine
- Coma
- Combat
- Combination Fire Departments
- Combustion
- Combustion Temperature
- Combustion Waves
- Command Posts
- Commerce
- Commercial Buildings
- Commercial Vehicles
- Communicable Diseases
- Communications
- Communications Centers
- Communications Systems
- Communism
- Communities
- Community Awareness Emergency Response
- Community Development
- Community Emergency Response Teams
- Community Health Services
- Community Organizations
- Community Policing
- Community Rating System
- Community Relations
- Community Risk Reduction
- Community Shelter Planning
- Company Inspections
- Company Officers
- Comparable Worth
- Compartments
- Compassion Fatigue
- Compensation
- Competition
- Complex Emergencies
- Compliance
- Composite Materials
- Comprehensive Cooperative Agreements
- Compressed Air
- Compressed Air Foam Systems
- Compressed Gases
- Compressors
- Computational Fluid Dynamics
- Computer Aided Dispatching