Saeed Uz Zaman Siddiqui (Urdu: سعید الزمان صدیقی; 1 December 1939 – 11 January 2017) (pronunciation 'sa'eed -uz- zam'an'; alternatively / officiallySaiduzzaman Siddiqui) was a Pakistani jurist and legislator of great prominence who formerly served as the 15th Chief Justice of Pakistan and, prior to that, the 7th Chief Justice of the Sindh High Court.

Justice Siddiqui passed Matriculation from the Board of Secondary Education from Dhaka, East Pakistan in 1952.

Justice Siddiqui was awarded honorary membership of the Judicial fraternity of Australia and Canada after the news of his resignation from the office of the Chief Justice was made public in January 2000, after his refusal to take the Oath under the PCO (Provisional Constitutional Order), which was an extra-constitutionally prescribed Oath for the Judges by the military regime of Pervez Musharraf.

He was elected Member of Managing Committee of Karachi High Court Bar Association for the year 1968–69.

The PCO not only negated the independence of the judiciary and democratic norms, but also prolonged the martial law by nullifying the effect of any judgement given against President Pervez Musharraf's government.

His tenure time period was shortened due to his refusal to take the Provisional Constitutional Order (PCO) Oath, prescribed by General Pervez Musharraf to legitimize the Legal Framework Order, 2002.

[6] On 9 November 2016, Nawaz Sharif contacted Justice Siddiqui and asked him to accept the position of the Governor, in the wake of event which followed the dismissal of Dr. Ishratul Ibad Khan.

[7][8][9] In 2018, Siddiqui was posthumously awarded the Sitara-i-Imtiaz - Pakistan's third highest civilian honour - by President Mamnoon Hussain.