Marion Smullen

Marion Smullen

Call: 1985


Marion Smullen is a hugely experienced and “highly regarded”  advocate specialising in serious crime.

She is regularly instructed in matters involving murder and attempted murder, manslaughter, rape, serious violence, fraud and  computer and internet offences. Marion has been described as someone who  thinks “outside the box” and someone who provides “total dedication to a case”.

Marion has led in numerous murder cases and has helped develop the law in a number of areas such as diminished responsibility.  Marion is regularly instructed both to prosecute and defend in serious criminal cases .

Marion has prosecuted in numerous complex cases such as cases involving county lines drug cases as well as highly sensitive rape cases and cases involving child cruelty.

Marion has also represented a large number of highly vulnerable defendants  including very young defendants and defendants with severe mental health problems.

She is regarded as a formidable opponent and is famous for her ability to win legal arguments in court.

Marion’s professionalism and depth of reputation is shown by the continuing high demand for her services from those that instruct her.

Marion is a Grade 3 prosecutor and RASSO approved.


  • R v PD and JC . Marion Smullen prosecuted in this case which involved the rape and  serious physical abuse of a 5 year old child who nearly died
  • R v MC, DC and NC Marion Smullen prosecuted the stranger rape of a young woman dragged off the street by three young men.
  • R v TJ,IM,PS,BD,SM and SL. Marion Smullen prosecuted a highly organised County Lines drug organisation.
  • R v SC Marion Smullen defended a young woman in a terrorist case.
  • R v SB Marion defended in a complex case involving Encron chat together with drugs and firearms.
  • R v NF    Marion Smullen defended in an arson case involving someone with severe mental health issues and the attempt to set fire to a residential building containing occupants.


  • B.A History London School of Economics
  • Post Graduate Certificate in Education
  • LLB in Law  London


  • Criminal Bar Association
  • South Eastern Circuit
  • Western Circuit


23 Oct 2020

Sneha Chowdhury: Jihadist’s sister sentence ‘not unduly lenient’. Marion Smullen appears in the High Court.

Marion Smullen was instructed by the Registrar of Criminal Appeals.

19 Aug 2020

Marion Smullen defends sister of London Pride terror plotter who practised knife fights with jhadi brother

Sneha Chowdhury, who practised knife fights with her brother, is given a suspended sentence after being found guilty of failing to inform police about...

18 Jun 2020

Enfield man jailed for knife-point rape of woman in her own bedroom

11 Feb 2020

Members of 2KBW involved in high profile terrorist trial

Mohiussunnath Chowdhury and his sister, Sneha Chowdhury, were convicted of terrorism offences following a lengthy trial at Woolwich Crown Court before HHJ Lees QC....


Crime Team
+44 20 7353 1746