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{{wiktionary}}
'''SO2''' or '''SO<sub>2</sub>''' may refer to:
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==Science==
* [[Sulfur dioxide]] (SO<sub>2</sub>), a colorless gas with a pungent smell
** [[Sulfonyl group]] (R-SO<sub>2</sub>-R), a functional group found primarily in sulfones, or a substituent
* SO(2), [[special orthogonal group]] of degree 2 in mathematics
* [[Oxygen saturation]] (SO<sub>2</sub>), the concentration of oxygen dissolved in a medium
* [[S2 (star)]] or S0–2, a star near the central black hole at the center of the Milky Way
* [[2015 SO2|2015 SO<sub>2</sub>]] or 2015 SO2, an Aten asteroid

==Military and police==
* SO2, a [[staff officer]] of the second class, often a commissioned officer of lieutenant commander, major or squadron leader rank
* SO2, a London Metropolitan Police [[Specialist Operations]] command division
* Special Operations 2 – Operational, of the British, World War II [[Special Operations Executive]]

==Other uses==
<!--* ''[[Star Ocean 2]]'', a video game (fails [[WP:DABACRO]])-->
* [[SO2 (album)|''SO2'' (album)]], a 2010 album by Shinichi Osawa

==See also==
{{Canned search|so2}}
* [[Oxygen saturation (medicine)]] (SaO<sub>2</sub>, SvO<sub>2</sub>, StO<sub>2</sub>, SpO<sub>2</sub>)
* {{lookfrom}}
* {{intitle}}
* [[Soso (disambiguation)]]
* [[Soo (disambiguation)]]
* [[SO (disambiguation)]]

{{Letter-Number Combination Disambiguation}}