Rai Bahadur (in North India) 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.

Bestowed mainly on Hindus, the equivalent title for Muslim and Parsi subjects was Khan 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.

Those awarded the Rai Bahadur title were usually drawn from the lower rank of Rai Sahib, both of which were below the rank of Dewan Bahadur.

A holder of a Rai Sahib, Rai Bahadur or Dewan Bahadur title came lower in the order of precedence.