Jack Duncan (rugby union)

Jack Duncan

Birth name	John L. Duncan
Date of birth	c. 1900
Place of birth	Sydney
Date of death	c. 1969
Rugby union career
Position(s) scrum-half Amateur team(s) Years Team Apps (Points) Randwick () International career Years Team Apps (Points) 1926 Wallabies 1 (0)

John L. Duncan (c. 1900 – c. 1969) was a rugby union player who represented Australia. Duncan, a scrum-half, was born in Sydney and claimed 1 international rugby cap for Australia.