There have been six Forster Baronetcies, four in the Baronetage of England, one in the Baronetage of Ireland and one in the Baronetage of the United Kingdom. All are extinct.

The Baronetcy of Forster of Bamburgh was created in the Baronetage of England by James I for Claudius Forster of Bamburgh Castle, Northumberland, on 7 March 1620.^[1]

The Forsters of Etherstone, Co Durham and Bamburgh, a long-established and prolific Northumbrian family, provided twelve successive Governors of Bamburgh Castle over a period of 400 years, but the family was ultimately ruined as a result of their part in the Jacobite risings in the 18th century. They subsequently lived for over 100 years at Adderstone, a property sometimes confused by modern-day Forsters with Etherstone.

The Baronetcy of Forster of Aldermaston was created in the Baronetage of England by James I for Humphrey Forster of Aldermaston Court, Berkshire on 20 May 1620.^[2]

The Forsters of Aldermaston descended from the Forsters of Harpsden in Oxfordshire and supposedly from the Forsters of Bamburgh Castle in Northumberland.

The Baronetcy of Forster of East Greenwich ^[3] was created on 11 July 1661 in the Baronetage of England for Reginald Forster, a London goldsmith who served at the Court of Charles I. The 2nd Baronet married a Warwickshire heiress but died childless and the Baronetcy became extinct.

The Baronetcy of Forster of Coolderry, County Monaghan ^[4] was created in the Baronetage of Ireland on 15 January 1794 for Thomas Forster.

The Baronetcy of Forster of Lysways Hall^[5] was created in the Baronetage of the United Kingdom on 17 March 1874 for Charles Forster, of Lysways Hall, Longdon, Staffordshire, Member of Parliament for Walsall 1852–91, son of Charles Smith Forster, banker, of Walsall, and High Sheriff of Staffordshire 1845.

The Baronetcy of Forster of The Grange was created in the Baronetage of the United Kingdom on 2 February 1912 for Ralph Forster, of The Grange, Sutton, Surrey.