William Tweedie CSI (1836–1914) was a soldier, diplomat and author, who served in India, Abyssinia and Turkish Arabia.

Tweedie's younger brother, John, served in the Indian Civil Service, progressing to Postmaster General of Bengal.

[1] After graduating from St Andrews College, Edinburgh as a Doctor of Divinity,[2] Tweedie joined the army of the East India Company at the age of 21.

[1] In November 1867 Tweedie was named as Political Secretary to Lt. Gen Sir Robert Napier, who was leading the Abyssinia Expedition, serving throughout the campaign and twice being mentioned in dispatches.

[1] Tweedie was then appointed as Resident of Turkish Arabia in Baghdad in 1881,[4] a role which involved inspecting all aspects of local life, including the trade in Arabian horses which he was especially interested in.