He was the second son of Haji Sir Abdullah Haroon, the first being Yusuf Haroon, one of the leaders of Pakistan Movement.  During his political career, Mahmoud Haroon served as two-time Governor of Sindh, Federal Interior Minister  , Federal Defence Minister, and Mayor of Karachi. He was also the founder of the Dubai-based newspaper Khaleej Times. 
He was the second son of Haji Sir Abdullah Haroon, the first being Yusuf Haroon, one of the leaders of Pakistan Movement. Both brothers, Mahmoud Haroon and Yusuf Haroon, had actively participated in the Pakistan Movement. During his political career, Mahmoud Haroon served as two-time Governor of Sindh, Federal Interior Minister during General Muhammad Zia-ul-Haq's regime , Federal Defence Minister, and Mayor of Karachi. He was also the founder of the Dubai-based newspaper Khaleej Times. Mahmoud Haroon passes away The News International (newspaper), Published 7 November 2008, Retrieved 27 May 2021
A
Both brothers, Mahmoud Haroon and Yusuf Haroon, had actively participated in the Pakistan Movement.
A
during General Muhammad Zia-ul-Haq's regime
A
Mahmoud Haroon passes away The News International (newspaper), Published 7 November 2008, Retrieved 27 May 2021