- G
- G Assist Guyana
- Guyana Shore Base Inc. (GYSBI)
- Guyfresh Trading
- Guyfresh Trading
- Guyfresh Trading
- G Mining Ventures (GMIN Ventures Guyana Inc.)
- Guyana Port Inc.
- Guyana Bank for Trade and Industry (GBTI)
- Grand Coastal Hotel
- Guyana Marriott Hotel Georgetown
- Georgetown Public Hospital Corporation (GPHC)
- Guyana Marketing Corporation (GMC)
- Guyana Times Inc. (Times Media Group)
- Georgetown International Academy
- Guyana Defence Force
- Guyana School of Agriculture (GSA)
- Guyana Lands and Surveys Commission (GLSC)
- Guyana Energy Agency (GEA)
- Guyana Lottery Company Ltd.
- Guyana Water Inc
- Guyana Power & Light
- Gizmos and Gadgets Group of Companies
- Guyana Revenue Authority
- Gafoors
- Guyana Logistics & Support Services Inc.
- Gizmos & Gadgets
- Guyana Telephone and Telegraph Company (GTT)
- S
- Sparkling Space Services
- Smart Tech Solutions and Construction
- SOL Guyana Inc.
- Starcomm Office Furniture Guyana Inc.
- Siemens Energy (Guyana)
- SLB (Schlumberger Guyana Inc.)
- Superior Blocks and Pavers
- Superior Woods Inc.
- Soesdyke/Te Huis Te/Coverden Neighbourhood Democratic Council
- SZZ Imports & Exports Distribution Company
- SBM Offshore