Sir James Peter Quilliam (23 March 1920 – 17 February 2004) was Chief Justice of the Cook Islands and a Judge of the High Court of New Zealand.
Quilliam graduated with an LLB from Victoria University of Wellington in 1943.
He practiced law in New Plymouth, then served as a High Court judge from 1969 to 1988 before becoming the first head of New Zealand's Police Complaints Authority (now the Independent Police Conduct Authority).
He became a Knight Bachelor in the 1988 New Year Honours.Quilliam later became a judge of the High Court of the Cook Islands and Cook Islands Court of Appeal and served as Chief Justice.