This chapter focuses on manslaughter, a common law homicide offence with an actus reus of unlawful conduct causing death. The spectrum of conduct and mens rea attracting liability for manslaughter covers all unlawful killings that fall short of murder. The chapter considers two categories of manslaughter: voluntary manslaughter and involuntary manslaughter. Voluntary manslaughter arises where D commits murder, but meets the criteria for one of the partial defences: loss of self-control, diminished responsibility, or suicide pact. Involuntary manslaughter arises where D does not commit murder, but commits a relevant manslaughter offence: unlawful act manslaughter, gross negligence manslaughter, or reckless manslaughter. The chapter explains statutory offences of unlawful killing (corporate manslaughter, driving causing death, infanticide, killing of a foetus) and concludes by outlining options for legal reform concerning voluntary manslaughter, involuntary manslaughter, and the structure of manslaughter offences. Relevant cases are highlighted with a summary of the main facts and judgment.