There have been two Baronetcies created for persons with the surname Thornhill, one in the Baronetage of England and one in the Baronetage of the United Kingdom. Both creations are extinct.

The Thornhill Baronetcy, of Olantigh

Olantigh

Olantigh is a property one mile north of Wye in Kent, southeast England. It includes a garden of 20 acres . The hamlet in which the property stands is Little Olantigh....

 in the County of Kent and of Barbados

Barbados

Barbados is an island country in the Lesser Antilles. It is in length and as much as in width, amounting to . It is situated in the western area of the North Atlantic and 100 kilometres east of the Windward Islands and the Caribbean Sea; therein, it is about east of the islands of Saint...

, was created in the Baronetage of England on 24 December 1682 for Timothy Thornhill, the member of an old Kent

Kent

Kent is a county in southeast England, and is one of the home counties. It borders East Sussex, Surrey and Greater London and has a defined boundary with Essex in the middle of the Thames Estuary. The ceremonial county boundaries of Kent include the shire county of Kent and the unitary borough of...

ish family. He was childless and the title became extinct on his death in circa 1693.

The Thornhill, later Compton-Thornhill Baronetcy, of Riddlesworth Hall in the Parish of Riddlesworth in the County of Norfolk and of Pakenham Lodge in the Parish of Pakenham in the County of Suffolk, was created in the Baronetage of the United Kingdom on 11 August 1885. For more information on this creation, see Compton-Thornhill Baronets

Compton-Thornhill Baronets

The Thornhill, later Compton-Thornhill Baronetcy, of Riddlesworth Hall in the Parish of Riddlesworth in the County of Norfolk and of Pakenham Lodge in the Parish of Pakenham in the County of Suffolk, was a title in the Baronetage of the United Kingdom. It was created on 11 August 1885 for Thomas...

.

Thornhill Baronets, of Ollantigh and Barbados (1682)

• Sir Timothy Thornhill, 1st Baronet (d. c. 1693)

Thornhill, later Compton-Thornhill Baronets, of Riddlesworth Hall and Pakenham Lodge (1885)

• see Compton-Thornhill Baronets
  Compton-Thornhill Baronets
  The Thornhill, later Compton-Thornhill Baronetcy, of Riddlesworth Hall in the Parish of Riddlesworth in the County of Norfolk and of Pakenham Lodge in the Parish of Pakenham in the County of Suffolk, was a title in the Baronetage of the United Kingdom. It was created on 11 August 1885 for Thomas...