A red triangle with one point down charged with five gold fleurs-de-lis, three and two, superimposed upon a gold circular bend bearing the motto "FULFILL YOUR MISSION" in black. The insignia is 1 inch (2.54 cm) in diameter.
The three points of the triangle are indicative of the numerical designation of the unit and also, of the 3rd Division to which the organization is assigned. The five fleurs-de-lis symbolize the major engagements in which the unit participated in World War I.
The distinctive unit insignia was originally approved for Headquarters and Headquarters Battery, 3rd Field Artillery Brigade on 4 February 1930. It was redesignated for Headquarters and Headquarters Battery, 3rd Infantry Division Artillery on 29 April 1952.