Retail Management System, a software application written by Microsoft

Republik Maluku Selatan, a separatist movement in Indonesia that first proclaimed an independent "Republic of South Maluku" in the 1950s....

Royal Masonic School, Hertfordshire, England

Reconfigurable Manufacturing System, a system designed at the outset for rapid change to quickly adjust its production capacity and functionality in response to sudden market changes and customer demand

Relocation management services (employee relocation firms)

A system that implements Records management

Rate-monotonic scheduling, a scheduling technique in operating systems

Robert May's School, in Hampshire, England

Railway Mail Service, US mail transportation service until the mid-20th century

Royal Melbourne Show

Royal Meteorological Society

Russ Martin Show

Royal Mail Ship or Steamer, ship prefix for vessels that carry mail under contract to the British Royal Mail

Risk Management Solutions, a company which provides financial risk advisory services and catastrophe modeling software.

Radnor Middle School, in Radnor, Pennsylvania, USA

Richland Middle School, in Richland Hills, Texas, USA

Romulus Middle School, in Romulus, Michigan

Reims Management School, in Rheims, France

Santiago Metropolitan Region (Región Metropolitana de Santiago) in Chile,

Royal Society of Miniature Painters Sculptors and Gravers, known as the Royal Miniatures Society

Roosevelt Middle School, in Oakland, California, USA

Richard M. Stallman (often abbreviated "rms"), veteran software developer and founder of the GNU Project and the Free Software Foundation.

RMS (band), a jazz/rock fusion band which consisted of guitarist, Ray Russell, bass player, Mo Foster and drummer Simon Phillips.

RMS granularity, a method of measuring photographic grain, developed by Kodak

Record Management Services, in OpenVMS

Record Management System, a persistent storage mechanism available to some J2ME configurations

Remote Manipulator System, a mechanical arm of the Space Shuttle that maneuvers payloads

Root mean square, a concept frequently encountered in statistics and electronics

Rights Management Services, a component of MS Windows Server 2003 used to restrict access to documents

Readington Middle School, in Readington, New Jersey, U.S.