The Leader of the Opposition is the people's elected politician who is, by law, the leader of the Official Opposition in Pakistan. The Leader of the Opposition is the leader of the largest political party in the National Assembly that is not in government. This is usually the leader of the second-largest political party in the National Assembly.

The Parliament of Pakistan is the supreme legislative body of the Islamic Republic of Pakistan. It is a bicameral federal legislature, composed of the President of Pakistan and two houses: the Senate and the National Assembly. The president, as head of the legislature, has the power to summon or prorogue either house of the Parliament. The president can dissolve the National Assembly, only on the Prime Minister's advice.