On 3 March 1914 the then municipality was granted the arms are those of the last Lords of Zillebeke, the Canton family, Viscounts of Winnezeele, which had in 1740 acquired the Ancien Régime estate of Zillebeke.
In World War I, like other parts of Ypres, it was the site of bipartisan heroism, with Victoria Crosses being won by two soldiers in the area, John Henry Stephen Dimmer and John Franks Vallentin, both in 1914. The village was mentioned in the Wipers Times, the most well-known of the trench magazines that were published by soldiers fighting on the front lines of the Great War.
The 1st Battalion of The Irish Guards suffered huge casualties defending the village and playing a major part in stopping the German breakthrough to the Channel Ports between 1 and 11 November 1914 as part of the First Battle of Ypres.
Located in or close to Zillebeke are Hill 60, the Hill 62 Memorial, The Bluff, the Sanctuary Wood Museum Hill 62 and the Sanctuary Wood CWGC Cemetery. Within Zillebeke Churchyard CWGC Cemetery, which forms part of the churchyard at Zillebeke Catholic parish church, there is a section with war graves of soldiers from aristocratic backgrounds; this plot is called The Aristocrat's Cemetery.