In this article, Mohamed Maghazi is referred to as رائد ميناء طنجة المدينة:

https://www.maptanger.ma/انتخاب-رائد-ميناء-طنجة-المدينة-رئيس...

Then there are various websites in English referring to the same person as the port master or ports manager:

https://www.medcruise.com/member/tangier

https://www.africanreview.com/ict/information-security/g4s-s...

In French, he is referred to as "Le commandant du port" which translates to "harbor master" in Google Translate:

https://www.maptanger.ma/fr/le-commandant-du-port-de-tanger-...

Definition of port master:
https://www.marineinsight.com/careers-2/who-is-a-harbour-mas...

The above link indicates that port master is the same as harbor master.

In the US, I am more familiar with the term "port commissioner," but I am not sure if it is the same role.

I think that "port master" is probably the best choice for Morocco. Also see the following:

https://ma.linkedin.com/in/mohamed-maghazi-16205a19b