Question-and-Answer Resource for the Building Energy Modeling Community
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Your post title mentions OpenStudio specifically, which I do not know of certifications for that specific tool. However, there are ways to achieve certification in general energy modeling practices, which you can certainly apply to OpenStudio projects.
General energy modeling certification
While not resulting in a license or certification for OpenStudio, there are multiple options for you to receive training.
OpenStudio training providers
There are also options for you to teach yourself how to use OpenStudio.
Teach yourself how to use OpenStudio
