The Government of the nation whose flag a vessel is entitled to fly.
Source: API RP 75, Recommended Practice for Development of a Safety and Environmental Management Program for Offshore Operations and Facilities: Upstream Segment, Third Edition, May 2004. Global Standards
Flag State means a State whose flag a ship is entitled to fly.
Source: IMO Resolution MSC.255(84), Code of the International Standards and Recommended Practices for a Safety Investigation into a Marine Casualty or Marine Incident (Casualty Investigation Code), 16 May 2008, International Maritime Organization. Regulatory Guidance