Imperial Service Order was established by King Edward VII in August 1902. It was awarded to the administration and clerical staff of the Civil Service throughout the British Empire for long and meritorious service. Normally a person must have served for 25 years to become elligible, but this might be shortened to 16 years for those serving in unsanitary locations. Both men and women were elligible for this order, and receipients of this one-class order are entitled to use the post-nominal letters 'ISO'.

The insignia of the order for men was an eight-pointed silver star, with the top ray obscured by a crown; the golden central medallion bore the cipher of the reigning monarch surrounded by the legend 'For Faithful Service'. This was suspended on a ribbon of crimson with a blue central stripe.

The insignia of the order for women had the same medallion as for men, surrounded by a silver laurel wreath and topped by a crown. This was suspended on a bow of crimson with a blue central stripe.

Junior staff of the Civil Service are elligible for the Imperial Service Medal, which is a silver circular medal bearing the effigy of the reigning monarch on one side, and the motif of a naked man resting after work with the legend 'For Faithful Service' on the other side. The ribbon or bow pattern is the same as the Imperial Service Order.

The Imperial Service Order was abolished during the 1993 reform of the British honours system, effectively replaced by the Officer grade of the Order of the British Empire; the Imperial Service Medal, however, continues to be awarded.

See also

• British and Commonwealth orders and decorations