NIO Views 14 meanings found NIO can denote a financial fund focused on insured municipal bonds, a national institute dedicated to oceanographic research, or a shorthand used in corporate or governmental settings for “not in order” or new initiatives. Medical Neurotechnology Industry Organization Miscellaneous New I/O Network I O Governmental New Initiatives Office New Imperial Order Northern Ireland Office Academic & Science National Institute of Oceanography Regional Nicaragua Cordoba Nioki, Zaire Computing New Input/ Output Business Nuveen Insured Municipal Opportunity Fund Not In Order Niocan Incorporated (de-listed) Nicklelore Ltd