Baron O'Neill
Blazon Arms: Quarterly:1st and 4th, per fess wavy the chief Argent and the base representing Waves of the Sea in chief a Dexter Hand couped at the wrist Gules in base a Salmon naiant proper(O'Neill); 2nd and 3rd, checky Or and Gules a Chief Vair(Chichester). Crests:1st: an Arm embowed in Armour the Hand grasping a Sword all proper; 2nd: a Stork rising with a Snake in its beak all proper. Supporters:On either side a Lion Gules gorged with an Antique Crown Argent pendant therefrom an Escutcheon the dexter charged with the Arms of O'Neill and the sinister with those of Chichester Coronet:That of a Baron.
Creation date	18 April 1868
Created by	Queen Victoria
Peerage	Peerage of the United Kingdom
First holder	William O'Neill, 1st Baron O'Neill
Present holder	Raymond O'Neill, 4th Baron O'Neill
Heir apparent	Shane Sebastian Clanaboy O'Neill
Status	Extant
Seat(s)	Shane's Castle
Motto	Above the Crests: INVITUM SEQUITUR HONOS(Honours follow us without seeking) Below the shield: LAMH DEARG EIRIN(The Red Hand of Ireland)

Baron O'Neill, ofShane's Castle in the County of Antrim, is a title in thePeerage of the United Kingdom.^[1] It was created in 1868 for the musical composerThe ReverendWilliam O'Neill. Born William Chichester, he succeeded to the estates of his cousin John Bruce Richard O'Neill, 3rdViscount O'Neill, in 1855 (on whose death the viscountcy and first barony of O'Neill became extinct) and assumed by royal licence the surname of O'Neill in lieu of Chichester in order to inherit the lands of his cousin, despite not being descended in the male line from an O'Neill.^[2] The Chichesters trace their lineage to the name O'Neill through Mary Chichester, daughter of Henry O'Neill of Shane's Castle. Lord O'Neill was the patrilineal great-great-great-grandson of John Chichester, younger brother ofArthur Chichester, 2nd Earl of Donegall.^[3] The latter two were both nephews ofArthur Chichester, 1st Earl of Donegall, and grandsons ofEdward Chichester, 1st Viscount Chichester (see theMarquess of Donegall for more information). Lord O'Neill was succeeded by his eldest son, the second Baron. He sat as aConservativeMember of Parliament forAntrim.

His eldest son and heir apparent, the Hon.Arthur O'Neill, representedAntrim Mid in theHouse of Commons as a Conservative from 1910 until 1914, when he was killed in action during theFirst World War, the first MP to die in the conflict. The second Baron was therefore succeeded by his grandson,Shane O'Neill, 3rd Baron O'Neill (the son of the Hon. Arthur O'Neill). He was killed in action inItaly during theSecond World War. The title is currently held by his son, the fourth Baron, who succeeded in 1944. He wasLord Lieutenant of Antrim from 1994 to 2008.

Two other members of the O'Neill family have been elevated to the peerage.Hugh O'Neill, 1st Baron Rathcavan, was the youngest son of the second Baron O'Neill, whileTerence O'Neill, Baron O'Neill of the Maine,Prime Minister of Northern Ireland, was the youngest brother of the third Baron.

The holders of the O'Neill and Rathcavan baronies are in the remainder of the titles Earl of Donagall, Viscount Chichester and Baron Chichester, though the chances of that happening are very slim.

The family seat isShane's Castle, nearRandalstown,County Antrim.

• William O'Neill, 1st Baron O'Neill (1813–1883)
• Edward O'Neill, 2nd Baron O'Neill (1839–1928)
• Shane Edward Robert O'Neill, 3rd Baron O'Neill (1907–1944)
• Raymond Arthur Clanaboy O'Neill, 4th Baron O'Neill (born 1933)

Theheir apparent is the present holder's son, the Hon. Shane Sebastian Clanaboy O'Neill (born 1965).

• Marquess of Donegall
• Earl O'Neill
• Baron Rathcavan
• Baron O'Neill of the Maine
• Robert Torrens O'Neill
• O'Neill dynasty

• Kidd, Charles, ed. (1903).Debrett's peerage, baronetage, knightage, and companionage. London:Dean & Son. p. 682.
• Leigh Rayment's Peerage Pages^{[self-published source][better source needed]}

• Baronies in the Peerage of the United Kingdom
• Noble titles created in 1868
• Extinct baronies in the Peerage of Ireland
• Chichester family

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