Rai Bahadur (in North India) Roy Bahadur (in Bengal) and Rao Bahadur (in South India), abbreviated R.B., was a title of honour bestowed during British rule in India to individuals for outstanding service or acts of public welfare to the Empire. From 1911, the title was accompanied by a medal called a Title Badge. Translated, Rai or Rao means "King", and Bahadur means "Brave". Bestowed mainly on Hindus, the equivalent title for Muslim and Parsi subjects was Khan Bahadur. For Sikhs it was Sardar Bahadur.
The title was given to recognise and reward individuals who had made significant contributions in various fields such as public service, commerce, industry, and philanthropy.