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
- Rh (digraph)
- Red Hat, a GNU/Linux operating system
- Robin Hood
- The RH postal area in the United Kingdom Royal Mail postcode system
- 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
- Respiratory Humidifier
- 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
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