Singapore is the first one that comes to mind.
See: https://www.wikiwand.com/en/Benevolent_dictatorship
Additionally monarchies are essentially old forms of dictatorship with slightly different customs and titles. It's one and the same and plenty of good kingdoms exist. I have PLENTY of examples:
The Pharaohs of ancient Egypt;
The Byzantine Emperors;
The Habsburg Monarchy in its various incarnations;
The Capetian Kings of France;
The Tsars;
The Tang, Ming and Qing - my three favorite Chinese dynasties;
The Incas.
If you’re looking for something more present-day, I’d look into Bhutan, Lichtenstein and Monaco.Tibet it also an example. A little iffy this one, it's actually not benevolent but the West has definitely painted them as such to use as propaganda against China. Chinas actions against Tibet were quite horrific and wrong but even still... Tibet was not an example of a benevolent dictatorship... more of an example how a dictatorship can be PERCIEVED as benevolent and how your perceptions can be easily influenced. Tibet and China is an example of evil acting on evil to simplify the situation, but again I want to emphasize that the actual reality is not so black and white.
You may also want to look into the term enlightened absolutism.
Also China is an example of a benevolent dictatorship despite all the bad things they've done (TBH China is more of a mixed bag, and by mixed bag I mean both benevolent and self interested at the same time... but then again so is the US).
You cannot deny that the rise of China has been unprecedented. The amount of people lifted out of poverty at such a velocity has never been seen before in the history of human civilization. That is benevolence. While of course what is happening in Xinjiang is not benevolence; blinding yourself to the good because of the bad is irrational. You must acknowledge both.