- commissar
- commissariat
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- commission
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- Commissioner for Local Administration
- commissioner for oaths
- Commission for Racial Equality
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- Committee of Correspondence
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- Common Agricultural Policy
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- common carotid artery
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- Common Entrance
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- Common Gateway Interface
- common gender
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- common-law
- common-law marriage
- common logarithm
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- common mallow
- Common Market
- common measure
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- common multiple
- common nail
- common noun
- commonplace
- commonplace book
- common pleas
- common prayer
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- common ratio
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- commons
- Commons
- common salt
- common school
- common scold
- common seal
- common sennit
- commonsense
- common sense
- Common Sense
- common-sense realism
- common situs picketing
- common stock
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- commonweal
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- Commonwealth Day
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- communication theory
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- communicology
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- Communion Sunday
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- Communist China
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- community association
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- Community Chests and Councils of America
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- Community Programme
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- Community Services Administration
- community singing
- community-supported agriculture
- community support officer
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- commutative law
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- commuter airplane
- commuter belt
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- Comodoro Rivadavia
- comonomer
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- Comoro Islands
- Comoros
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- Comox
- comp
- comp.
- Comp. Gen.
- compact
- compact camera
- compact disc
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- compact disc player
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- compact disk
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- comparable worth
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- comparative advertising
- comparative government
- comparative judgment
- comparative linguistics
- comparative literature
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