England grants unusually broad responsibility for sentencing of criminal offenders to voluntary part-time lay magistrates who, like their legally trained professional colleagues, sentence a wide range of offenders. Using simulated cases, archival analyses, and observational techniques, this article compares the sentencing decisions of the lay and professional magistrates in London. The study reveals no evidence of the lay preference for more severe sentencing that is typically shown in public opinion polls. The extent to which legal training, court experience, panel decisionmaking and role within the court system can explain the relative leniency of the lay magistrates are considered Consistent with results from other studies, these findings suggests that when laypersons assign sentences to particular offenders rather than express generalized satisfaction or dissatisfaction with current sentencing practices, laypersons are no more punitive than professional judges.