The Order of the Brothers of the Sword (German: Schwertbrüderorden , officially the Brothers of the Military Service of Christ in Livonia)  was a Catholic military order of knights founded in 1202 by the priest Theoderich or possibly Bishop Albert of Riga.

The army of the order was defeated at the battle of Saule in 1236. In 1237 it joined with the Teutonic Knights and was called the Order of Livonia.