ROH

ROH can stand for:
Registered Occupational Hygienist, a professional occupational hygiene (health) designation administered by the Canadian Registration Board of Occupational Hygienists (CRBOH)
"Radius of Hollow", a measurement of the depth of the hollow grind on the bottom of an ice skate blade
Revoluční odborové hnutí, a historical (1945-1990) monopolistic communistic labour union in former Czechoslovakia
Ring of Honor, a national professional wrestling promotion in the United States
Rohm and Haas, a major chemical manufacturing company
Royal Opera House, London, England
A generic alcohol
The ISO 639-3 code for the Romansh language