Stakeholders, who are they? A stakeholder is a person, or a group of persons, or an organization, who has some kind of interest in, and/or may influence, or may be/perceive to be influenced by, and/or can bring a value—which could be either positive or negative—to the project, the program, the portfolio and/or the organization. Stakeholders are central in all projects and operations, because they are both the doers and the beneficiaries of each project, and while, on the one side, the stakeholder work is basic for project implementation, on the other side, the stakeholder satisfaction is directly related to the project value and, therefore, is the main project success factor. Achieving stakeholder satisfaction requires a strategic approach that includes understanding stakeholder needs and expectations, engaging in meaningful dialogue, and implementing effective practices, while, from the practical point of view, specific measures and data analysis and management are required. Despite the challenges, organizations that prioritize stakeholder satisfaction are well positioned for sustainable growth and long-term success, and, then, stakeholder satisfaction may be considered a cornerstone of organizational success and a critical driver of value creation in the modern business landscape.