Which is the best food auditing course for a food microbiologists

Audit based on HACCP or ISO22000 is good for food safety.
the course will teach you the audit skills and techniques, but the technical knowledge can be gained by practice or separate course.
I also recommend GLP courses in the field of Drugs & Pharmaceutical

First try to do any course on HACCP & food safety.
This course will make your base strong for auditing.
In order to audit any food safety standard, you should have good knowledge of that standard.
For auditing there are lot of consultants who provide Internal auditing courses.
In riyadh there is1 consultancy.
Diversy if you need more details contact me on

1-six sigma 2-TQM 3-iso22000 & HACCP 4-GMP

It depends upon what kind of certification you are interested to audit. Different industries have different types of certifications and auditing will depend upon those certifications.

HACCP level 3.

Food safety level 4

this will give you basic food safety knowledge.

After that yiu may go for auditing training.