Harry O’Sullivan

Harry O’Sullivan

Call: 2016

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Harry O’Sullivan is a specialist criminal barrister who joined Goldsmith Chambers following the completion of his pupillage in 2018.

He accepts instructions to both defend and prosecute in criminal cases and to appear in extradition, inquest and regulatory proceedings. He is authorised to conduct work on a direct access basis and is appointed to the CPS Advocate Panel at Grade 2.

Harry has a particular interest in sentencing law. He is the author of Banks on Sentence, a leading practitioner text on the subject, and is the consultant editor for the upcoming 2021 sentencing title for Halsbury’s Laws of England. Before coming to the Bar, Harry worked at the Law Commission of England and Wales as a research assistant assigned to the Sentencing Code project.


Interested in instructing Mr O'Sullivan?

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Crime Barrister

Harry is regularly instructed to appear in the Crown Court in London and the South-Eastern circuit. He is appointed to the Crown Prosecution Service advocate panel scheme at grade 2. He has experience in private prosecutions.

As the author of Banks on Sentence, Harry has specialist knowledge of complex sentencing legislation and procedure and is happy to accept instructions to advise on appeal against sentence on a direct access basis.

Harry’s experience also extends to representing parties in regulatory appeals to the magistrates’ court and in matters of prison law before the Parole Board.

Notable Cases

  • Operation Alatyr – Central Criminal Court – 2020-ongoing. Harry is currently instructed as junior prosecution counsel in a seven-handed case involving the seizure of significant quantities of class A and B drugs.
  • R v PS – Norwich Crown Court – December 2020. Secured a suspended sentence for a client convicted of possession of a bladed article.
  • R v MK– Southwark Crown Court – December 2020. Secured conviction for offensive weapon offence.
  • R v SL – Wood Green Crown Court – July 2020. Represented a vulnerable defendant throughout proceedings serious sexual offences against a child.
  • Central Bedfordshire Council v GD – Luton Crown Court – November 2019. Prosecution on behalf of local authority trading standards involving a substantial fraud committed against a small business.
  • R v Craftsman Q – Bulford Military Court Centre – August 2019. Represented a defendant before the Court Martial for ABH charges.
  • R v PS – Norwich Crown Court – July 2019. Prosecution for possession of a bladed article in prison.
  • R v CH – Basildon Crown Court – June 2019. Prosecution resulting in convictions for possession of machetes in a public place.
  • R v AM – Woolwich Crown Court – April 2019. Trial for possession of bladed article.
  • R v LM – Lewes Crown Court – April 2019. Successful appeal against sentence for breaches of restraining order resulting in the sentence length being significantly reduced.
  • R v S and others – St Albans Crown Court – March 2019. Multi-handed conspiracy to supply class A drugs. CPS offered no evidence against client after serving an application to dismiss charges for lack of evidence.
  • Central Bedfordshire Council v M – Luton magistrates’ court – March 2019. Represented the local authority in appeal by a homeowner against a statutory nuisance abatement notice (smoke pollution), resulting in the appeal being dismissed and the notice upheld.
  • R v M – St Albans Crown Court – January 2019. Negotiated a plea to assault PC being accepted by the Crown in circumstances where the defendant had been charged with attempted GBH.
  • R v D – Chelmsford Crown Court – November 2018. Secured a suspended sentence following a guilty plea to high-value dwelling burglary.
  • R v Fusilier JT – Bulford Military Court Centre – October 2018. Obtained a service supervision and punishment order following a plea to an Armed Forces Act offence at Court Martial.


  • R v D [2019] Crim LR 436 – concerning the definition of a folding pocketknife for the purposes of Criminal Justice Act 1988 s 139.
  • When is a residential address a dwelling for the purposes of sentencing?’ (2017) 2 (Aug) Sentencing News 6-9.
  • The Sentencing Code’ (2017) 181 (29) Criminal Law & Justice Weekly
  • Time For A Code: Reform of Sentencing Law in England and Wales’ European Journal of Law Reform (2017) 19)4) – with Professor David Ormerod QC

Inquests and Inquiries Barrister

Harry is a member of Goldsmith Chambers inquest team and accepts instructions to represent and advise interested persons and represent before Coroners’ inquests and public enquiries.

Notable Cases

In the matter of the inquest touching upon the death of AM – Berkshire Coroner’s Court – May 2018. A pre-inquest review at which it was successfully argued that the state’s Article 2 duty would only be discharged by a full ‘Middleton’ inquest.

Extradition Barrister

Harry is keen to develop a practice in the field of extradition law and is happy to accept instructions to advise and represent requested persons at extradition hearings and appeals, as well as to act on behalf of requesting states for the Crown Prosecution Service.

Michael Johnson

Find the right barrister

Please contact Michael Johnson one of our Clerks, who will advise you on the best representation for your requirements and budget. Please call on 0207 427 7173 or email.

Education & Qualifications

  • BPTC (Outstanding), University of Law (2015-16)
  • LLB with European Legal Studies (Upper Second-Class honours), King’s College London (2011-15)
  • Diploma of European Union Legal Studies (Very good), University of Toulouse (2014)


  • CPS Advocate Panel at Grade 2
  • Criminal Bar Association
  • South Eastern Circuit
  • Gray’s Inn



  • Francis Bacon Award, Gray’s Inn (2015)
  • Routledge Book Prize, King’s College London (2015)
  • University of Law Selection Event Award (2015)
  • James Hunt Prize for Advocacy, Gray’s Inn (2018)
  • Ann Goddard Pupillage Scholarship, Gray’s Inn (2018)

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