Lieutenant colonel Sir James Hayes Sadler KCMG CB FRGS (11 October 1851 – 21 April 1922) was a British colonial administrator and governor of Kenya and the Windward Islands.
In 1893 and again from 1893–94, he was Chief political resident of the Persian Gulf (for Bahrain, Kuwait, Oman, Qatar, and the Trucial States).
[4] On 12 December 1905, Sadler was appointed the first governor of the British East African Protectorate, succeeding commissioner Donald William Stewart who died in office on 1 October 1905.
[5] In 1909 he was transferred to be Governor and Commander-in-Chief of the Windward Islands and their Dependencies, a post he filled until 1914.
[6] After nomination by his father, he became a Fellow of the Royal Geographical Society in December 1901,[7] eventually resigning in 1921.