| Cal Poly Humboldt Presents | Gustwurrak Student Activities Center, Room 248 | 826-3928 | |
| Calendars and Events | | | |
| California Center for Rural Policy (CCRP) | House 71 | 826-3400 | 826-3403 |
| California Cooperative Fish & Wildlife Research Unit | Wildlife & Fisheries 212 | 826-3268 | 826-3269 |
| California Environmental Legacy Project | Science A room 358 | 826-5552 | 826-3201 |
| California Faculty Association | Siemens Hall Room 003 | 826-3340 | |
| California State University Employee Union (CSUEU) | Siemens Hall 003 | | |
| Campaign - See Boldly Rising Campaign | | 826-5200 | |
| Campus Assistance, Response, and Engagement (CARE) | | | |
| Campus Disability Resource Center (formerly Student Disability Resource Center) | Library 005 | 826-4678 | 826-5397 |
| Campus Emergency Response Team | | | |
| Campus Recreation | Recreation & Wellness Center | 826-3357 | 826-3354 |
| Campus Resilience and Response | Student and Business Services Room #311 | 826-4635 | 826-3312 |
| Campus Status and Emergency Conditions | | | |
| Campus Store | Gutswurrak Student Activities Center Third Floor | 826-3741 | 826-5804 |
| Cannabis Studies | BSS Room 518 | 826-3139 | 826-3139 |
| Canvas | LIB 311 | 826-4460 | |
| Canvas Support | LIB 311 | 826-4460 | |
| Career Development Center | NHE 118 | 826-3341 | 826-5473 |
| CARES Reporting | | | |
| Cashiers Office: see Student Financial Services | Student & Business Services 285 | 826-6789 | 826-5280 |
| Catalog | | | |
| Catering Services (Humboldt Catering) | Gustwurrak Student Activities Center - 3rd Floor | 826-4001 | |
| CCAT - Campus Center for Appropriate Technology | Buck House | 826-3551 | |
| Center Activities (Outdoor Adventures) | Recreation & Wellness Center | 826-3357 | 826-3354 |
| Center for Community Based Learning | Library 26 | 826-4963 | |
| Center for Educational Excellence, Collaboration and Inquiry | | | |
| Center for Teaching and Learning (CTL) | Library 315B | 826-4461 | |
| Centers and Institutes | | 826-5165 | |
| Central Events | Student & Business Services 311 | 826-3512 | 826-3312 |
| Chancellor's Office, CSU | | | |
| CHECK IT | RWC 122A | 826-5235 | |
| Chemistry & Biochemistry | Science-A 470 | 826-3277 | |
| Child Development | Harry Griffith Hall 229 | 826-3471 | 826-4270 |
| Child Development: Lab | Child Development Lab | 826-3475 | 826-4270 |
| Children's Center | Trinity Early Learning Center | 826-3838 | 826-5671 |
| Children's Center: Preschool Care | Trinity Early Learning Center | 826-4982 | 826-5671 |
| Children's Center: Toddler Care | Trinity Early Learning Center | 826-4601 | 826-5671 |
| Clubs & Organizations | Gustwurrak Student Activities Center, 238 | 826-3776 | |
| CNRS Core Research Facility | Science B 230 | 826.3272 | |
| Coastal Ocean Currents Monitoring Program (COCMP) | The Marine Lab | 826-5827 | 826-3682 |
| College of Arts, Humanities & Social Sciences | Gist Hall 122 | 826-4491 | 826-4498 |
| College of Extended Education | Student & Business Services 211 | 826-3731 | 826-5885 |
| College of Natural Resources and Sciences | Forestry 101 | 826-3256 | 826-3562 |
| College of Professional Studies | Gist Hall 214 | 826-3961 | 826-3963 |
| Comida (La Comida nos Une) | | | |
| Commencement (Graduation Ceremony) | Humboldt Bay Aquatic Center 214 | 826-4194 | |
| COMPASS | Feuerwerker House | 826-4998 | |
| Communication | Telonicher House 101 | 826-3261 | 826-5419 |
| Community Relations: see Public Affairs | Nelson Hall West 104 | 826-3390 | |
| Commuting | | | |
| Complaint Process Coordinator | Siemens Hall 212 | 826-3387 | |
| Computer Science | BSSB 320 | 826-3143 | 826-3833 |
| Computing & Telecommunications Services: see Information Technology Services | Van Matre Hall 200 | 826-3815 | 826-6100 |
| Conference & Event Services | | 826-5986 | |
| Coral Sea Research Vessel | | | |
| Counseling & Psychological Services | Health Center | 826-3236 | 826-5735 |
| Course Evaluations by Students | | | |
| Criminology & Justice Studies | BSS 506 | 826-3139 | 826-4418 |
| Critical Race, Gender, and Sexuality Studies (CRGS) | BSSB 206 | 826-4329 | 826-4320 |
| Cultural Centers for Academic Excellence | Nelson Hall East 215 | 826-4589 | 826-3363 |
| Cultural Resources Facility | BSS 124 | 826-5247 | 826-4336 |
| Curriculum Committee, Integrated | Siemens Hall 217A | 826-3949 | 826-5480 |
| Curriculum Development | Siemens Hall 218 | | |
