RH

RH, Rh, rH, or rh can stand for:

• Riemann hypothesis, an important unsolved problem in mathematics
• Ryan's Hope, a soap opera
• Rhesus factor, a classification to describe blood types in humans
• Rhodium, a chemical element
• Republic Express Airlines (IATA airline designator)
• Right-handed
• Reinhard Heydrich, a chief of the Reich Security Main Office, Nazi Germany
• Rh (digraph)
• Red Hat, a GNU/Linux operating system
• Restoration Hardware, an American furniture chain of home furnishings, hardware, and outdoor and garden products
• Robin Hood, a heroic outlaw in English folklore
• The RH postal area in the United Kingdom Royal Mail postcode system
• Rolf Harris, Australian entertainer
• Rumbling Hearts, an anime
• Rubeus Hagrid, a character in the Harry Potter series
• Releasing hormone
• Rush hour, the two parts of the day with busy traffic caused by commuting
• Rush Hour (film series)
• Reproductive health
• Rydberg Constant, the Rydberg Constant for Hydrogen
• The Right Honourable
• Radiohead, an English alternative rock, electronica and experimental music band
• Ron Howard, an actor
• Robert Heinlein, an author
• Relative humidity, the amount of water vapor that exists in a gaseous mixture of air and water vapor