Liaquat Ali Khan is the Prime Minister of Pakistan who served the longest in a single continuous term. He was appointed as the first Prime Minister of Pakistan on 15 August 1947 and remained in office until his assassination on 16 October 1951. His uninterrupted service lasted for over 4 years and 2 months (1,524 days), making him the longest-serving Prime Minister in one term.

Liaquat Ali Khan was a close companion of Quaid-e-Azam Muhammad Ali Jinnah and a founding leader of Pakistan. After independence, he played a key role in forming Pakistan’s first government and setting the direction of the new nation. His government faced many challenges, including administrative setup, migration issues, economic difficulties, and foreign policy decisions.

Unlike many later Prime Ministers who were removed through military takeovers, dismissals, or legal disqualifications, Liaquat Ali Khan completed most of his term until his death. His tenure is remembered for introducing important policies and for his dedication to the democratic process during the early years of Pakistan.

Important facts:
- Name: Liaquat Ali Khan
- Term: 15 August 1947 – 16 October 1951
- Duration: 1,524 days (about 4 years and 2 months)
- First Prime Minister of Pakistan
- Died while in office during a public speech in Rawalpindi

This is a key question in general knowledge, Pakistan studies, and competitive exams. It highlights the early leadership and political history of Pakistan.