IRM may refer to: * IERS Reference Meridian *

Illinois Railway Museum The Illinois Railway Museum (IRM, reporting mark IRMX) is the largest railroad museum in the United States. It is located in the Chicago metropolitan area at 7000 Olson Road in Union, Illinois, northwest of downtown Chicago. Overview Histo ...

Illinois Reserve Militia The Illinois Reserve Militia was the state defense force of Illinois during World War I and World War II. After the Illinois National Guard was federalized, the Illinois Reserve Militia was organized to assume the stateside duties of the National ...

, state defense force active during World War II * Bureau of Information Resource Management, responsible for information technology of the U.S. Department of State *

Information Rights Management Information rights management (IRM) is a subset of digital rights management (DRM), technologies that protect sensitive information from unauthorized access. It is sometimes referred to as E-DRM or Enterprise Digital Rights Management. This can ca ...

* Intermediate Restorative Material (Dentistry)

Zinc oxide eugenol Zinc oxide eugenol (ZOE) is a material created by the combination of zinc oxide and eugenol contained in oil of cloves. An acid-base reaction takes place with the formation of zinc eugenolate chelate. The reaction is catalysed by water and is acc ...

* L'Institut Royal Météorologique de Belgique *

Interference reflection microscopy Interference reflection microscopy (IRM), also called Reflection Interference Contrast Microscopy (RICM) or Reflection Contrast Microscopy (RCM) depending on the context, is an optical microscopy technique that leverages interference effects to for ...

, a microscopy method used to image adherent cells * Internal Revenue Manual, an official compendium of internal guidelines for personnel of the United States Internal Revenue Service * ''

International Review of Mission ''International Review of Mission (IRM)'' is a Bi-Annual academic journal An academic journal or scholarly journal is a periodical publication in which scholarship relating to a particular academic discipline is published. Academic journals ...

'', a quarterly academic journal * International Roaming MIN assigned by

IFAST International Forum on ANSI-41 Standards Technology (IFAST) is the coordinator for the allocation of System Identification Numbers (SID) for wireless communication outside Canada, the United States and territories, and on the assignment of Internat ...

* ''IRM'' (album), by Charlotte Gainsbourg * Iron Mountain Incorporated, a data storage company based in Boston, Massachusetts * ICAO designator for Mahan Air, an Iranian airline * Islamic Republic of Mauritania * Irish Republican Movement

See also