Colonel Sir Thomas Courtenay Theydon Warner, 1st Baronet CB (19 July 1857 – 15 December 1934) was a British politician, who served as the Member of Parliament (MP) for North Somerset from 1892 to 1895, and for Lichfield from 1896 to 1923.

Warner was an officer in the 3rd (Militia) Battalion, Oxfordshire and Buckinghamshire Light Infantry, where he became major on 13 January 1902.

Sir Courtenay Warner lived in the former Manor House of Highams, which was sold to Essex County Council 1922 for £7000.

His ancestors built the Grade II listed Clock House villa in Walthamstow (now flats).

This article about a Liberal Member of the Parliament of the United Kingdom representing an English constituency is a stub.