The flag of Norfolk Island features three vertical stripes, with the left and right stripes in green and the center stripe in yellow. In the upper hoist corner is the island's emblem, which depicts a Norfolk Pine surrounded by two green triangles.

The aspect ratio of the flag is 1:2. The height of the emblem is 7/10ths the width of the flag, while the height of the triangles is 1/10th the width of the flag. The color codes for the flag are:

• Green: Pantone 356
• Yellow: Pantone 116

The flag has no specific geometric properties or measurements beyond the aspect ratio mentioned above.