Rom
Rom, or ROM may refer to:

Biomechanics and medicine
Risk of mortality, a medical classification to estimate the likelihood of death for a patient
Rupture of membranes, a term used during pregnancy to describe a rupture of the amniotic sac
Range of motion, e.g. of joints in physiotherapy

Computers and mathematics
Android ROM, a file containing executable instructions of an Android OS
Read-only memory, a type of storage media that is used in computers and other electronic devices
ROM cartridge, a portable form of read-only memory
ROM image, a computer file which contains a copy of the data from a read-only memory chip
ROM (MUD), a popular MUD codebase

Engineering
Range of motion, the distance that a movable object may normally travel while properly attached to another object
RFID on metal, radio-frequency identification (RFID) tags which perform a specific function when attached to metal objects
Rough order of magnitude, a type of cost estimation

Fiction and entertainment
Ethan Rom, one of the Others in the TV series Lost
Rom (comics), a Marvel Comics superhero based on the Parker Brothers toy of the same name
Rom (Star Trek), a Ferengi character in Star Trek: Deep Space Nine
Rom, a fictional character in Hyperdimension Neptunia Mk2
Runes of Magic, a popular MMORPG
Rom, a boss in the videogame Bloodborne
Read-Only Memory (publisher), a British publisher of art books related to the Britsoft era of video game development
Rom (album)

Places and structures
River Rom, England
Rom (river), Switzerland and Italy
Rom, Afghanistan, a village in Sar-e Pol province, Afghanistan
Rom, Deux-Sèvres, a commune in the Deux-Sèvres department in western France
Rom (Mecklenburg), a community in the district of Parchim, Mecklenburg-Vorpommern, Germany
Rom, a district of Morsbach in North Rhine-Westphalia, Germany
Rom, Iran, a village in South Khorasan Province, Iran
Royal Ontario Museum, a museum in Toronto, Ontario, Canada
The Rom, skatepark in Hornchurch, East London, England
Romania, UNDP code and former IOC code

Society
Rom (plural Roma), one of the ethnic designations used by the Romani people
rom, Romani language, language code ISO 639 alpha-2
Rom or ROM, system of Indigenous Australian customary law
ROM ceremony, a Yolngu ceremonial practice

Other uses
Return on margin, a judge of performance based on the net gain or net loss compared to the perceived risk
Refuel On the Move, a DoD logistic action
Epistle to the Romans, a book of the Bible commonly abbreviated Rom.