Joseph Dennis Parker, OM (born 9 January 1992), is a New Zealand professional boxer of Samoan heritage. He held the WBO heavyweight title from 2016 to 2018, and previously multiple regional heavyweight championships including the WBO Oriental, Africa, and Oceania titles; as well as the PABA, OPBF, and New Zealand titles. As an amateur he represented New Zealand at the 2010 Commonwealth Games in the super-heavyweight division, and narrowly missed qualification for the 2012 Summer Olympics.
Parker turned professional in July 2012 with Duco Events in Auckland, under the tutelage of Sir Bob Jones. After defeating Andy Ruiz for the vacant WBO title, Parker became the first heavyweight boxer from either New Zealand or the Pacific Islands to win a major world championship. As of August 2019, he is ranked as the world's eighth best active heavyweight by The Ring magazine and ninth by the Transnational Boxing Rankings Board (TBRB). During his reign as WBO champion, he reached a peak active heavyweight ranking of third by the TBRB.