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.
The RBS-15 (Robotsystem 15) is a long-range fire-and-forget surface-to-surface and air-to-surface, anti-ship missile.