An administrator ad litem is a person appointed by a court to administer a deceased person’s estate solely for the purposes of particular proceedings, usually where no personal representative exists, or the existing executor or administrator cannot or should not act in those proceedings. The role is limited and procedural: the administrator ad litem is given authority to represent the estate in specific litigation (for example, a negligence claim, probate dispute or dependency claim) without having full powers to distribute or manage the estate generally.In England and Wales and Northern Ireland, appointment is typically made under the court’s inherent or statutory jurisdiction in probate or civil proceedings, and the expression “administrator ad litem” is descriptive rather than a distinct statutory office. In Ireland, similar practice exists, often linked to contentious probate or fatal injuries claims. In Scotland, a roughly equivalent concept arises through appointment of a judicial factor or executor dative for limited purposes, though the precise terminology “administrator ad litem” is less common.The appointment safeguards procedural fairness, ensures the estate can sue or be sued, and avoids delay where there is dispute, conflict of interest, or absence of a functioning personal representative.