President of Pakistan Iskander Mirza, with the support of General Ayub Khan and the army, suspends the 1956 constitution, imposes martial law, and cancels the elections scheduled for January 1959.

Sahibzada Iskander Ali Mirza (Urdu: , Bengali: ; 13 November 1899 13 November 1969), CIE, OSS, OBE, was a Pakistani general officer and Bengali civil servant who was the first President of Pakistan. He was elected in this capacity in 1956 until being dismissed by his appointed army commander General Ayub Khan in 1958.Mirza was educated at the University of Bombay before attending the military college in Sandhurst in the United Kingdom. After a brief military service in the British Indian Army, he joined the Indian Political Service and spent the majority of his career as a political agent in the Western region of the British India until elevated as joint secretary at the Ministry of Defence in 1946. After the independence of Pakistan as result of the Partition of India, Mirza was appointed as first Defence Secretary by Prime Minister Liaquat Ali Khan, only to oversee the military efforts in first war with India in 1947, followed by failed secessionism in Balochistan in 1948. In 1954, he was appointed as Governor of his home province of East Bengal by Prime Minister Mohammad Ali of Bogra to control the law and order sparked as a result of the popular language movement in 1952, but later elevated as Interior Minister in Bogra administration in 1955.

Playing a crucial role in ousting of Governor-General Sir Malik Ghulam, Mirza assumed his position in 1955 and was elected as the first President of Pakistan when the first set of Constitution was promulgated in 1956. His presidency, however, marked with political instability which saw his unconstitutional interferences in the civilian administration that led to the dismissal of four prime ministers in a mere two years. Facing challenges in getting the political endorsements and reelection for the presidency, Mirza surprisingly suspended the writ of the Constitution by having imposed martial law against his own party's administration governed by Prime Minister Feroze Khan on 8 October 1958, enforcing it through his army commander General Ayub Khan who dismissed him when the situation between them escalated, also in 1958. Mirza lived in the United Kingdom for the remainder of his life and was buried in Iran in 1969.His legacy and image is viewed negatively by some Pakistani historians who believe that Mirza was responsible for weakening of democracy and political instability in the country.

The president of Pakistan (Urdu: صدر پاکستان, romanized: s̤adr-i Pākiṣṭān), officially the President of the Islamic Republic of Pakistan, is the ceremonial head of state of Pakistan and the commander-in-chief of the Pakistan Armed Forces.The office of president was created upon the proclamation of Islamic Republic on 23 March 1956. The then serving governor-general Iskander Mirza assumed office as the first president. Following the 1958 coup d'etat, the office of prime minister was abolished, leaving Presidency as the most powerful office in the country. This position was further strengthened when the 1962 Constitution was adopted. It turned Pakistan into a Presidential Republic, giving all executive powers to the president. In 1973, the new Constitution established Parliamentary democracy and reduced president's role to a ceremonial one. Nevertheless, the military takeover in 1977 reversed the changes. The 8th Amendment turned Pakistan into a semi-presidential republic and in the period between 1985 and 2010, the executive power was shared by president and prime minister. The 18th Amendment in 2010 restored Parliamentary Democracy in the country, and reduced presidency to a ceremonial position.

The constitution prohibits the president from directly running the government. Instead, the executive power is execrsised on his behalf by the prime minister who keeps him informed on all matters of internal and foreign policy, as well as all legislative proposals. The Constitution however, vests the president with the powers of granting pardons, reprieves, and the control over the military; however, all appointments at higher commands of the military must be made by the President on a "required and necessary" basis, upon consultation and approval from the prime minister.The president is indirectly elected by the Electoral College for a five-year term. The Constitution requires the president to be a "Muslim of not less than forty five (45) years of age". The president resides in an estate in Islamabad known as Aiwan-e-Sadar (President's House). In his absence, the chairman of Senate exercises the responsibilities of the post, until the actual president resumes office, or the next office holder is elected.

There have been a total of 13 presidents. The first president was Iskander Ali Mirza who entered office on 23 March 1956. The current office holder is Arif Alvi, who took charge on 9 September 2018, following his victory in the 2018 elections.