Gregory John Welch OAM[1] (born in 1964 in Campsie, Sydney), known as Greg Welch, is an Australian triathlete.

Greg was an ambassador to the UNHCR (United Nations High Commissioner for Refugees) in 2000.

[citation needed] Due to his being diagnosed with ventricular tachycardia, he has undergone nine open-heart surgeries from 2001 until 2003 and has retired from sports.

He is married to fellow Ironman triathlete Sian Welch.

This biographical article related to an Australian known for competing in triathlons is a stub.