There have been two Baronetcies created for members of the McMahon family, both in the Baronetage of the United Kingdom. One creation is extant as of 2007.

The McMahon Baronetcy, of Dublin, was created in the Baronetage of the United Kingdom on 6 May 1815 for William MacMahon

William MacMahon

William MacMahon was an Irish judge and member of a Limerick family which became prominent largely through personal influence over the Prince Regent.- Background :...

 who was Master of the Rolls in Ireland

Master of the Rolls in Ireland

The office of Master of the Rolls in Ireland originated in the office of the keeper of the Rolls in the Irish Chancery and became an office granted by letters patent in 1333. It was abolished in 1924....

. The title became extinct on the death of the fourth Baronet in 1926.

The McMahon Baronetcy, of Ashley Manor, was created in the Baronetage of the United Kingdom on 7 August 1817 for John McMahon, Member of Parliament

Member of Parliament

A Member of Parliament is a representative of the voters to a :parliament. In many countries with bicameral parliaments, the term applies specifically to members of the lower house, as upper houses often have a different title, such as senate, and thus also have different titles for its members,...

 for Aldeburgh

Aldeburgh (UK Parliament constituency)

Aldeburgh was a parliamentary borough represented in the House of Commons of the Parliament of the United Kingdom and its predecessor bodies.The town was enfranchised in 1571 as a borough constituency...

 from 1802 to 1812 and Private Secretary

Private Secretary to the Sovereign

The Private Secretary to the Sovereign is the senior operational member of the Royal Household of the Sovereign of the United Kingdom, as distinct from the Great Officers of the Household. The Private Secretary is the principal channel of communication with Her Majesty's Government and the...

 to George IV

George IV of the United Kingdom

George IV was the King of the United Kingdom of Great Britain and Ireland and also of Hanover from the death of his father, George III, on 29 January 1820 until his own death ten years later...

 from 1811 to 1817. He was the brother of the first Baronet of the 1815 creation. McMahon was succeeded according to a special remainder by his second brother, the second Baronet. He was a General in the Army and served as Commander-in-Chief

Commander-in-Chief

A commander-in-chief is the commander of a nation's military forces or significant element of those forces. In the latter case, the force element may be defined as those forces within a particular region or those forces which are associated by function. As a practical term it refers to the military...

 of the Forces at Bombay.

The family surname is pronounced "McMahn".

McMahon Baronets, of Dublin (1815)

• Sir William MacMahon
  William MacMahon
  William MacMahon was an Irish judge and member of a Limerick family which became prominent largely through personal influence over the Prince Regent.- Background :...
  
  , 1st Baronet (1776-1837)
• Sir Beresford Burston McMahon, 2nd Baronet (1808-1873)
• Sir William Samuel McMahon, 3rd Baronet (1839-1905)
• Sir Lionel McMahon, 4th Baronet (1856-1926)

McMahon Baronets, of Ashley Manor (1817)

• Sir John McMahon, 1st Baronet (d. 1817)
• Sir Thomas McMahon, 2nd Baronet (1779-1860)
• Sir Thomas Westropp McMahon, 3rd Baronet (d. 1892)
• Sir Aubrey Hope McMahon, 4th Baronet (1862-1893)
• Sir Horace Westropp McMahon, 5th Baronet (1863-1932)
• Sir Eyre McMahon, 6th Baronet (1860-1935)
• Sir (William) Patrick McMahon, 7th Baronet (1900-1977)
• Sir Brian Patrick McMahon, 8th Baronet (b. 1942)