- Grandiff Medical Supplies
- Greater Baltimore Medical Center
- Hagerstown Maryland Convention and Visitors Bureau
- Hampton Inn Baltimore-Glen Burnie
- Hampton Inn Baltimore-Washington International Airport
- Hampton Inn Bowie
- Hampton Inn Salisbury
- Hampton Inn, Frederick
- Harford County, Maryland - Dept of Law
- Hargrove, Inc.
- Harkins Builders
- Harrison Group Resort Hotels
- Health Care for the Homeless
- Health Resources and Services Administration Bureau of Health Administration
- Hebrew Homes of Greater Washington
- Hedrick Enterprises
- Herbert Brown
- Hilton Garden Inn, Baltimore, MD
- Holiday Inn Express and Suites Laurel
- Holiday Inn Select
- Holiday Inn Silver Spring, MD
- Holiday Inn, Frederick, MD
- Holiday Inn, Inner Harbor, Baltimore, MD
- Holiday Inn-Hagerstown
- Holiday Inn-Pokomoke City
- Holiday Inn-Salisbury
- Holiday Inn-Timonium
- Holy Cross Germantown Hospital
- Holy Cross Hospital
- Homewood At Williamsport Maryland, Inc.
- Hopkins Inn
- Hospitality Partners
- House of Manall
- Howard Community College
- Humane Society of the United States - Gaithersburg
- Humphrey Companies
- ICAT Expo
- Iconographic Designs
- IEPMPG - International Entertainment Production and Meeting Presentation Group
- Immersion Medical
- Indian Health Service HIS)
- Infinite Legacy
- Information Inc.
- International Destinations, Inc.
- International History Week Awards Committee
- International Police Mountain Bike Association
- Intuitive Business Concepts
- IQ Solutions
- ISG Solutions
- Ismart LLC