OOM
OOM or oom may refer to:

Science and technology
 Out of memory, a pathological state of a computer operation
 Object-oriented modeling, a modeling paradigm mainly used in computer programming
 Order of magnitude, a measurement term

Person
Oom is the style of calling a male person as an uncle.
 Paul Kruger (1825–1904), former president of the Transvaal Republic nicknamed Oom Paul
 Govan Mbeki (1910–2001), South African politician and father of Thabo Mbeki nicknamed Oom Gov
 Raymond Mhlaba (1920–2005), South African politician and first Premier of the Eastern Cape nicknamed Oom Ray

Other uses
 Order of Myths, an Alabama Mardi Gras organization
 Officer of the Order of Merit of the Police Forces (post-nominal letters)
 Zoom Airlines (ICAO code)
 Oom, a villain character; see List of Batman: The Brave and the Bold characters
 Odyssey of the Mind (OoM), a creative problem-solving competition
 Out of mana (OOM),  in video games where characters do not have enough mana for its abilities.