Major-General Sir James Carmichael-Smyth, 1st Baronet, KCH, CB (22 February 1779 – 4 March 1838) was a British Army officer and colonial administrator.

Carmichael-Smyth was born in London the eldest son of Scottish physician and medical writer, James Carmichael Smyth and Mary Holyland.

[1] His younger brother Henry Carmichael-Smyth, would achieve distinction as an officer serving the East India Company and for being the step-father of William Makepeace Thackeray.

One of the chief engineering officers of the British Army in Southern Africa between 1795 and 1808, he then went to Spain under Lieutenant-general Sir John Moore in 1808–9.

From 1813 to 1815 he was stationed in the Low Countries and was present at the ill-fated Siege of Bergen op Zoom in 1814 before going on to command the Royal Corps of Engineers & Sappers at Waterloo.