The Massacre of Garron II refers to the SEY 2792 genocide of the indigenous inhabitants of the planet Garron II under the orders of ImperatorLinton Messer XI.

In 2792, Linton XI sold off the terraforming rights of Garron II to the Bright Worlds Terraforming Group (BWTG). Fully aware that one of the indigenous species was sapient, Linton XI authorized the BWTG to proceed. The species was exterminated alongside most other forms of life on Garron II.

An anti-Messer revolutionary group called Tide obtained footage documenting the atrocity and released it over spectrum, interrupting broadcasts galaxy-wide. The vids sparked an outrage among the long-oppressed population of the United Empire of Earth (UEE). Subsequent riots and military action led to the end of the 246 year Messer dynasty.