When you may use the logo
GMP+ logos may only be used by certified companies and accepted certification bodies, and only in the following ways:
On or near business locations and transport vehicles
On your website
On documents related to products or services within the scope of your GMP+ certification
Logos must always be used in the official design and colours provided by GMP+ International (including approved black and white versions).

You can download the zipfile with the logos here.
When you may NOT use the logo
Use of GMP+ logos is not permitted:
On products, labels, or packaging (e.g. bags, bulk packaging or pallets)
If your company is not listed in the GMP+ Company database
If your company has temporary acceptance status
Misuse and enforcement
Any misuse of GMP+ logos or trademarks must be reported to GMP+ International without delay. GMP+ International and Certification Bodies are authorised to take appropriate action in case of misuse.
Prohibited use
Users are not permitted to:
Create or use logos that resemble or refer to GMP+ logos or trademarks
Register GMP+ logos or trademarks, in whole or in part, or any variation thereof
Use GMP+ logos or trademarks in a company name, product name, or service name
Any violation may result in liability for damages and associated costs.