Rb or RB may stand for:
RBL/Ratnakar Bank Limited is a scheduled commercial bank, headquartered in the Mumbai region of Maharashtra, India.
RBW (Korean:알비더블유; an acronym for Rainbow Bridge World) is a South Korean entertainment company founded by Kim Jin-woo and Kim Do-hoon.
RBT is an Australian factual television series that looks at the everyday workings of sobriety check points by Random Breath Testing (or RBT) police units, and is narrated by Australian actor Andrew Daddo.