Any individual, group or organization that can affect, be affected by, or perceive itself to be affected by, a risk (ISO/IEC Guide 73). 
Risk perception depends on the stakeholder’s needs, issues and knowledge. Risk perception can differ from objective data.
European Project Definitions
The CIPRNet project  uses the following definition:
Stakeholder is a person or organization that can affect, be affected by, or perceive themselves to be affected by a decision or activity.
Key stakeholders of CIPRNet are: (1) Governmental CIP/CIR policy-makers; (2) CI operators; (3) Public crisis management/emergency management organisations; (4) Private sector crisis management/emergency management (e.g. of CI operators); (5) CIP R&D community (academic and applied R&D).
Stakeholder: Tutti coloro (persone, gruppi, organizzazioni, istituzioni) che hanno interesse per l’operato dell’impresa, a maggior ragione se tale operato produce nei loro confronti un impatto diretto sul piano economico – come per gli azionisti, i dipendenti, i clienti e i fornitori – ma anche se la relazione è più indiretta e lontana, come nel caso dell’interesse della collettività alla preservazione dell’ambiente. 
Botaki aika a irekereke: Aomata ke botaki ake a na rotaki n te aro ae a bon ataia ae a na bon rotaki man kanganga ke kabuanibwai aika a na rikiki. 
Stakeholders: Those people and organisations who may affect, be affected by, or perceive themselves to be affected by a decision, activity or risk.
Stakeholder: People, including organisations, who have an investment, financial or otherwise, in the consequences of any decisions taken. 
Stakeholders are those parties that are affected by, or represent those affected by, decisions made by network companies and Ofgem. As well as consumers, this would for example include Government and environmental groups. 
Person or group of people that holds a view that can affect the organization.
Person or organization that can affect, be affected by, or perceive themselves to be affected by a decision or activity.