The National Assembly of Pakistan, also referred to as Aiwān-ē-Zairīñ, is the lower house of the bicameral Parliament of Pakistan, with the upper house being the Senate. As of 2023, the National Assembly has a maximum membership of 336, of which 266 are directly elected by an adult universal suffrage and a first-past-the-post system to represent their respective constituencies, while 60 are elected on reserved seats for women and religious minorities from all over the country. Members hold their seats for five years or until the house is dissolved by the President on the advice of the Prime Minister. The house convenes at the Parliament House, Red Zone, Islamabad.

Members are elected through the first-past-the-post system under universal adult suffrage, representing electoral districts known as National Assembly constituencies. According to the constitution, the 70 seats reserved for women and religious minorities are allocated to the political parties according to their proportional representation.

Each National Assembly is formed for a five-year term, commencing from the date of the first sitting, after which it is automatically dissolved. The National Assembly can only be dissolved by the President of Pakistan on the Prime Minister of Pakistan advice, it cannot be dissolved by the Prime Minister alone.

On 3 April 2022, President of Pakistan Arif Alvi dissolved the Assembly Under Section 58-I and 48-I on the advice of Prime Minister Imran Khan. On 7 April, the Supreme Court of Pakistan set aside the dissolution order, restoring the National Assembly. After these events, on 11 April, after National Assembly proceedings, a vote was held on deciding the next prime minister of Pakistan, overseen by Ayaz Sadiq. There were only two candidates contesting, from the PTI, was Shah Mehmood Qureshi, and from the PMLN, Shehbaz Sharif. Before the vote, 123 members of the PTI resigned from the National Assembly. The vote would be conducted under the supervision of Ayaz Sadiq, resulting in the election of Shehbaz Sharif as the Prime Minister of Pakistan. Following this, large political crises occurred across Pakistan in late 2022 and for the duration of 2023 between the ousted Imran Khan and Prime Minister Shehbaz Sharif until a new assembly was elected in early 2024.

The current National Assembly is the 16th National Assembly of Pakistan, which was formed in February 2024 after the 2024 Pakistani general election. The election was contested for rigging. The 16th assembly has seen various shuffles, including a large bloc of Independent politicians backed by PTI use the Sunni Ittehad Council as a parliamentary vehicle, and several reserved seats being suspended by the Supreme Court of Pakistan due to the Reserved seats case.

The first session of the first Constituent Assembly of Pakistan was held on 10 August 1947 at Sindh Assembly Building, in Karachi. On 11 August 1947, Quaid-i-Azam Muhammad Ali Jinnah was elected unanimously as the President of the Constituent Assembly of Pakistan and the National Flag was formally approved by the Assembly.

... you are now a sovereign legislative body and you have got all the powers. It, therefore, places on you the gravest responsibility as to how you should take your decisions.

— Muhammad Ali Jinnah, in his presidential address to the First Constituent Assembly of Pakistan on 11 August 1947