St George's Day is a special day for the King's Own. On this day in November 1688, William of Orange landed at Torbay and the King's Own was the first Regiment to join him on arrival in England. Shortly after this, King James II, the reigning Roman Catholic Monarch, fled to France in the event known as the Glorious Revolution or Revolution of 1688.

William III of Orange-Nassau was a Dutch aristocrat and stadtholder, and he ruled England, Scotland, and Ireland jointly with his wife, Mary II. For the 4^th's support, William of Orange bestowed upon the Regiment the right to wear the Lion of England as its badge. St. George's Day became "the" Regimental day for the King's Own.

Ever since the year of Our Lord 1704, St. George's Day has been celebrated by the Regiment and traditionally, operational commitments permitting, it has been customary to hold a ceremonial parade. All ranks wear the red rose of England in their caps and a wreath of red roses is placed on both Colours (the Queen's Colour and the Regimental Colour). The Regimental drums are also garlanded with roses.

St. George's Day is celebrated in England on April 23, the accepted date of Saint George's death in 303. Once a major holiday on par with Christmas, St. George's day is not celebrated as much as other national holidays since the 18th Century.