| HEC | Ham Egg and Cheese 
| Others |
| HEC | Handicapped Encounter Christ
| Others |
| HEC | Hardware Engineer Conference
| Others |
| HEC | Harrisonburg Electric Comission
| Others |
| HEC | Harrisonburg Electric Commission
| Others |
| HEC | Harrisonburg Electric Company
| Others |
| HEC | Harsh Environment Connector
| Others |
| HEC | Harvard Environmental Chamber
| Others |
| HEC | Haryana Engineering College
| Others |
| HEC | Hasselblad Electric Camera
| Others |
| HEC | Hautes Etudes Commerciales
| Others |
| HEC | Hawaii Employers Council
| Others |
| HEC | Hawaiian Educational Council
| Others |
| HEC | HDMI Ethernet Channel
| Others |
| HEC | Head Error Control
| Others |
| HEC | Header Error Check
| Others |
| HEC | Header Error Checksum
| Others |
| HEC | Header Error Control
| Others |
| HEC | Header Error Correction
| Others |
| HEC | Header Error Count
| Others |
| HEC | Header Extension Code
| Others |
| HEC | Headline Example Comment
| Others |
| HEC | Headquarters Entertainment Corporation
| Others |
| HEC | Health and Employment Counseling
| Others |
| HEC | Health Education Campus
| Others |
| HEC | Health Education Center
| Others |
| HEC | Health Enhancement Communities
| Others |
| HEC | Health Enhancement Community
| Others |
| HEC | Healthy Eaters Club
| Others |
| HEC | Healthy Environments Collaborative
| Others |
| HEC | Heavy Engineering Corporation
| Others |
| HEC | Helicopter Element Coordinator
| Others |
| HEC | Hellenic Electronic Center
| Others |
| HEC | Herbarium Eric Coppejans
| Others |
| HEC | Herolchi Electronic Company
| Others |
| HEC | High Efficiency Compatible
| Others |
| HEC | High End Computing
| Others |
| HEC | High Endurance Cutter
| Others |
| HEC | High-Elongation Carbon
| Others |
| HEC | High-End Computer
| Others |
| HEC | Higher Education Center
| Others |
| HEC | Higher Education Challenge
| Others |
| HEC | Higher Education Commission
| Others |
| HEC | Highly Emetogenic Chemotherapy
| Others |
| HEC | Hillside Electronics Corporation
| Others |
| HEC | Hillsides Education Center
| Others |
| HEC | Hitachi Enterprise Cloud
| Others |
| HEC | Holden's Engine Company
| Others |
| HEC | Home Education Connection
| Others |
| HEC | Home Education Convention
| Others |
| HEC | Home Entertainment Center
| Others |
| HEC | Homeownership Education and Counseling
| Others |
| HEC | Honda Estilo Club
| Others |
| HEC | Hoosier Environmental Council
| Others |
| HEC | Horticultural Elephant Controversy
| Others |
| HEC | Hospital Energy Corporation
| Others |
| HEC | Hotel Ezra Cornell
| Others |
| HEC | Houston Emergency Center
| Others |
| HEC | HTTP Event Collector
| Others |
| HEC | Humanitarian Evacuation Cell
| Others |
| HEC | Hunger Energy And Cravings
| Others |
| HEC | Hunger Energy Cravings
| Others |
| HEC | Hybrid Electric Cluster
| Others |
| HEC | Hybrid Electronic Cluster
| Others |
| HEC | Hydraulic Elevating Cab
| Others |
| HEC | Hydrogen Enhanced Combustion
| Others |
| HEC | Hydrologic Engineering Center
| Others |
| HEC | Hyundai Engineering Company
| Others |