Khan Bahadur Bakshi Ghulam Haider Khan (died 1828 AD) was Faujdar of a unit at the time of Battle of Assaye, which was a major battle of the Second Anglo-Maratha War under the command of Major General Arthur Wellesley (Duke of Wellington).
He was in charge of intelligence gathering, and also made recommendations to the royal court for military appointments and promotions.
Because of his services in the army under the command of (Duke of Wellington), he was awarded the title 'Khan Bahadur' and a land of 1400 Bigha at Rewari.
In 1817, he vehemently opposed the action of Appa Sahib when he was conspiring against British forces; as a result Appa Sahib was deposed and forwarded to Allahabad in custody, while Khan Bahadur Bakshi Ghulam Haider Khan was placed as 'Kamidan', a commandant in the army.
His one son, Inayat Ali Khan received pension of rupees 600 against the services in army and for the same reason, he remained Honorary Magistrate at Rewari, District Gurgaon.
The second son of Amanul Haq, Abdul Ali Khan was Risaldar in one of the Punjab regimentduring 1857 War of Independence.