RWH may refer to:

• Rainwater harvesting
• Random walk hypothesis
• Red wine headache a bad headache that occurs in many people after drinking even a single glass of red wine
• Revolutionary Workers Headquarters, a U.S. Marxist-Leninist organization that formed out of a split from the Revolutionary Communist Party (RCP) in 1977
• Ridley–Watkins–Hilsum theory
• Real World Haskell, a book about the Haskell programming language