Where can I find a complete list of Cloud Providers of the world?

Yes the list covers almost all the components within the nomenclature of cloud computing i.e. from cloud products to solutions & services.

But not sure why you need this comprehensive list in your research?

Perhaps you might want to shorten the list to target your research purpose can be a better idea?

Also since you are citing from wikipedia, the components might change (add or remove) from time to time.

The service providers are Google, Amazon.com, and Yahoo! as well as IBM, Intel, Microsoft and SAP.

I think the list is not comprehensive like Rackspace, and others this Quora link give some examples

https://www.quora.com/What-companies-are-excellent-cloud-computing-service-providers

I'm interesting..

I have tried to create a comprehensive list here: https://drive.google.com/file/d/1R0QMmw5X8dmBeuVjkg46zCSVB-8GcsNZ/view?usp=sharing

https://data-flair.training/blogs/cloud-service-providers-companies/

I recommended answer Rajat Tandon