What is the collective noun for harem?

There isn't a widely accepted or traditional collective noun specifically for a harem.

However, you could use:

* A retinue of wives/concubines

* A bevy of women (though this is less specific to a harem and more general)

* A group of wives/concubines (simply and straightforward)

Ultimately, the best choice depends on the context and desired tone of your writing.