A silver color metal and black, red, white and silver gray enamel device 1 1/8 inches (2.86 cm) in height overall, divided by a silver gray sword point down between two horses addorsed in gallop, on the left red and on the right white, both cut at mid-torso. Attached above the device, a red scroll inscribed "WESTFIELD" and attached below the device, a red scroll inscribed "HIGH SCHOOL" in base metal letters.
Black, red and white are the school's colors. The horses represent the school's mascot, the Mustang. The sword signifies strength and honor.
The shoulder loop insignia was approved on 13 February 2006.