The acronym "OBE" stands for British honour officer of the Order of the British Empire. The full name of this order of chivalry is actually Officer of the Most Excellent Order of the British Empire.
An OBE is the most junior order of chivalry in the British system. The Order was established in 1917 by King George V. The Order has five classes of award, and the acronym OBE refers only to an Officer, which is the fourth in terms of seniority. Becoming an OBE requires the recipient to swear allegiance to the Head of State of the United Kingdom.