Private John Earnest Gaiser (or Geiser) was an English soldier of the British Army who died during the First World War.
He was born in 1897, in Lambeth, the son of Swiss-born hotel porter John and Alice Gaiser, of Canterbury, Kent. At the time of the 1911 census, the Gaiser family were residing at 15 Ashcombe Road, Wimbledon.
Gaiser died on 20 February 1918, during the Sinai and Palestine Campaign against the Ottoman Empire, while serving with the 2/15th (County of London) Battalion (Prince of Wales's Own Civil Service Rifles), The London Regiment.
He is buried in Jerusalem War Cemetery, Israel.
- Gaiser, J E, cwgc.org. Retrieved 9 November 2012.