A chief executive officer (CEO, American English), managing director (MD, British English),executive director (ED, American English) for non-profit organizations, or chief executive is the highest-ranking corporate officer (executive) or administrator in charge of total management of an organization. An individual appointed as a CEO of a corporation, company, organization, or agency typically reports to the board of directors.

The responsibilities of an organization's CEO (US) or MD (UK) are set by the organization's board of directors or other authority, depending on the organization's legal structure. They can be far-reaching or quite limited and are typically enshrined in a formal delegation of authority.

Typically, the CEO/MD has responsibilities as a communicator, decision maker, leader, and manager. The communicator role can involve the press and the rest of the outside world, as well as the organization's management and employees; the decision-making role involves high-level decisions about policy and strategy. As a leader, the CEO/MD advises the board of directors, motivates employees, and drives change within the organization. As a manager, the CEO/MD presides over the organization's day-to-day, month-to-month, and year-to-year operations.