| Sydney Earnest Christian | |
| Birth Date: | 17 April 1868 |
| Birth Place: | Sydney, New South Wales |
| Death Place: | Sydney, New South Wales |
| Allegiance: | Australia |
| Branch: | Australian Army |
| Serviceyears: | 1891–1918 |
| Rank: | Brigadier General |
| Commands: | 5th Division Artillery (1916–17) 1st Field Artillery Brigade (1914–16) 1st Battery, Royal Australian Field Artillery (1910–14) |
| Battles: | Second Boer War First World War |
| Awards: | Companion of the Order of St Michael and St George Mentioned in Despatches (2) Legion of Honour (France) |
Sydney Earnest Christian, (17 April 1868 – 17 May 1931) was an Australian Army colonel and temporary brigadier general in the First World War. He retired in 1918 with the rank of honorary brigadier general.