Constituent or constituency may refer to:

• An electoral district or constituency
• Constituent, an individual citizen or voter represented by a politician within an electoral district, state, community, or organization
• Advocacy group or constituency
• Constituent assembly
• Constituent state (territory, country, etc.): an administrative division of a larger state

• Constituent (linguistics), a word or a group of words that function as a single unit within a hierarchical structure
• Constituent quark, a current quark with a notional "covering"

• Ingredient
• Part (disambiguation)