A minister without portfolio is a government minister without specific responsibility as head of a government department. The sinecure is particularly common in countries ruled by coalition governments and a cabinet with decision-making authority wherein ministers without portfolio, while they may not head any particular offices or ministries, may still receive a ministerial salary and have the right to cast a vote in cabinet decisions. The office may also exist to give party leaders whose offices would not otherwise enable them to sit in Cabinet.

A minister is a politician who heads a ministry, making and implementing decisions on policies in conjunction with the other ministers. In some jurisdictions the head of government is also a minister and is designated the 'prime minister', 'premier', 'chief minister', 'chancellor' or other title.