Jack Sincock
- Born 28 November 1897
- Died unknown
- Last rank Private
- Service number N/N
- Served In B Company
- Next of Kin Mrs. Sincock (mother), 35 Haast Street, Christchurch
- Pre-war occupation Labourer for R. Lambie
- ReligionPresbyterian
- Enlisted18 July 1917