Rao Bahadur and Rai Bahadur, 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, 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.

Title Badges were presented to Indian citizens who received certain formal titles of honour during British rule in India. They ceased to be awarded in 1947 on Indian independence.