Sir Thomas Wolseley Haig KCIE CSI CMG CBE (7 August 1865[1] – 28 April 1938[2]) was British soldier, civil servant and academic.

He was a civil servant in British India, then Professor at Trinity College, Dublin, and later a Scottish herald.

[1] Haig joined the Seaforth Highlanders in 1884 and was transferred to the Indian Army in 1887 where he served in Upper Burma (1887–89) fighting "dacoits" (bandits).

[1] Haig became Assistant Secretary to the Government of India, Foreign Department, in 1907, then Political Agent in Alwar, 1907–08.

Following the assassination of Sir Curzon Wyllie in London by Madan Lal Dhingra in 1909, Haig was appointed officiating Political ADC to the Secretary of State for India 1909–10 (Lord Morley).

[1] Soon after Haig returned to Europe, he was appointed Professor of Arabic, Persian and Hindustani at Trinity College, Dublin.