There are multiple definitions - click on the translation that matches your context.

Aufsichtsbehörde

Substantiv

full

regulatory authorities

noun

Comparative law notes

This English phrase - also in the singular, "regulatory authority" - is the best functionally equivalent translation. The adjective "regulatory" is synonymous with "supervisory" Americans tend to use the word "agency" in lieu of "authority; such as "regulatory agency" or "government agency"; both also adequate translation of "Aufsichtsbehörde" for an American audience.

Definitions of regulatory authorities

public bodies that make and enforce relevant rules and regulations in relation to, for example, a specific industry

The relevant regulatory authorities should be informed of the company's recent activities.