A portable passenger seat divider and method for providing a protective separator between adjacent seats. The passenger seat divider includes a middle portion formed into a channel that is adapted to be removably mounted to an armrest disposed between the adjacent seats. The passenger seat divider also includes an upper portion extending above the armrest when the passenger seat divider is mounted to the armrest and a lower portion adapted to extend below the armrest of the seat when the passenger seat divider is mounted to the armrest.