Contract Research Organization - organisations predominant in the pharmaceuticals and clinical research industry

Chief Risk Officer, Chief Research Officer, or Corporate Responsibility Officer of a company

Cro, a concept in early Scots law described in the Leges inter Brettos et Scottos

Cró, a concept in early Irish law also called Éraic

Cathode Ray Oscilloscope - displays on a screen rapidly changing electrical signals with the help of Cathode Ray Tube

Companies Registration Office - Irish company registry office

A Clinical research organization in a clinical trial.

CRO is the ICAO airline designator for Crown Airways, United States

The letters ČRo is used by the Czech public radio broadcaster, Český Rozhlas. There was a short lived animated tv series named Cro (cancelled).