In Gorre British and Indian Cemetery, France is the Commonwealth War Grave of 102646 Sapper John Forster, serving with the 176th Tunnelling Company, Royal Engineers who died 30/10/1915.

In Alnwick Churchyard is a family headstone which reads:
In loving memory of
Jane Millar
beloved daughter of
Arthur & Isabella Forster
who died Nov. 22 1894 aged 10 years.
also of Arthur their son
who died Sept. 16 1914 aged ?30 years
Also of
Sapper John Forster, R.E.
their son who was killed in action
in France Oct. 30 1915
aged 35 years.
Interred in Gorre British Cemetery
Beuvry, east of Bethune.
And of Christina Forster
grand-daughter of the above
who died Jan.7 1912
aged 10 months.
Also of the above
Isabella Forster
who died at Ashington May ?3 1927
aged 72 years
Also of the above
Arthur Forster
who died at Ashington March 10 1922
aged ?80 years

Soldiers Died in the Great War states that he was born in Alnwick, enlisted in London and resided in Seaton Hirst.

John Forster is remembered at Alnwick on A11.01 and A11.03 and in Ashington on A17.01 (A17.27) and A17.43