Andrew Thomas Cayley, CMG KC FRSA (born 1964), is a King's Counsel and was His Majesty's Chief Inspector of the Crown Prosecution Service from 2021 until February 2024.

He was junior prosecuting counsel in the trial that led to the ICTY's first conviction for genocide in respect of events at Srebrenica in July 1995.

In 2001 he was appointed a Senior Trial Attorney of the International Criminal Tribunal for the Former Yugoslavia by Carla Del Ponte, Prosecutor of the ICTY.

In that capacity he was responsible for the case against General Ratko Mladic and led the first prosecution of members of the Kosovo Liberation Army.

In February 2005, he was appointed Senior Trial Attorney at the International Criminal Court (ICC) by the Prosecutor Luis Moreno Ocampo.

He led the legal team which succeeded in closing the ICC's Preliminary Examination of allegations of war crimes by British Forces in Iraq from 2003 to 2009.