What is the collective noun for managers?

There isn't a widely accepted, specific collective noun for managers.

Here are a few options you could consider, depending on the context:

Formal:

* A team of managers

* A group of managers

* A board of managers

Informal:

* A gaggle of managers (playful, humorous)

* A hive of managers (suggests busy activity)

Ultimately, the best choice depends on your specific needs and the tone you want to convey.