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Kitty St. Aubyn
Of Counsel

Kitty St Aubyn

(Barrister)

Languages
  • English

Kitty delivers practical, strategic advice on investigations, criminal litigation and compliance. A barrister of 15 years’ call, she has extensive experience with prosecuting and investigating authorities and in parallel criminal and civil proceedings. She specialises in matters that carry legal, regulatory, and reputational risk, from bribery, fraud, money laundering and sanctions, to inquests and public inquiries. Her cross-sector practice draws on CMS’s expertise to help clients manage legal, regulatory, and reputational risks in high-pressure situations.

From 2011 to 2022, she practised at a Legal 500 and Chambers & Partners Band 1 chambers, bringing frontline experience in complex proceedings. She has acted for lead parties in high-profile cases including the SFO USD LIBOR prosecution, the News International phone-hacking trial, the Grenfell Tower Inquiry, and matters before the Court of Appeal and Supreme Court.

Kitty serves on the board of the Expert Witness Institute and is a committee member of both Women in Criminal Law and CMS Women. She publishes and speaks widely on criminal law and is a contributing author to the 2025 edition of Smith & Owen on Asset Recovery: Criminal Confiscation and Civil Recovery (Oxford University Press).

Awards & Recognitions
01
  • Quote
    "Kitty St Aubyn is a rising star who brings razor-sharp thinking and a flair for financial crime. Her barrister background shows in her ability to spot the points which will unravel the regulator's case theory."
    Legal 500 2026
  • Quote
    "Kitty St Aubyn is an expert in all forms of criminal conduct and is particularly well placed to advise corporates facing criminal charges."
    Legal 500 2026
  • Quote
    "The CMS team is vastly experienced in corporate representation…adding some fantastic talent over recent years. They fight with real force and devastating legal precision for their clients."
    Legal 500 2026
  • Quote
    "Kitty St Aubyn is extremely hardworking and dedicated to her clients."
    Legal 500, 2025

Memberships & Roles

  • Fraud Lawyer’s Association
  • Criminal Bar Association
  • The Middle Temple
  • Women in Criminal Law. 

Insights by Kitty

Epstein, Privilege & the Long Arm of the Law

27 Feb 2026 6 min read

New policing structures: “The British FBI”?

30 Jan 2026 4 min read

From pixels to property: The emergence of in‑game virtual assets as criminal “property” in R v Lakeman

29 Jan 2026 6 min read

Companies House

15 Jan 2026 2 min read
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