RMR?

RMR layout (of an automobile), see Rear mid-engine, rear-wheel-drive layout

Registered Merit Reporter, a certification offered by the National Court Reporters Association

Resting Metabolic Rate, see basal metabolic rate

Revelstoke Mountain Resort, a Canadian ski resort located in Revelstoke, British Columbia

Rock Mass Rating: rock mass classification system (geotechnical engineering)

Royal Marines Reserve

The Royal Montreal Regiment, a Canadian Forces infantry regiment based in Montreal

Rick Mercer Report, a Canadian Comedy Television series

Rabbi Michael Rosensweig, a Canadian born rabbi

Must be the Rebbe!