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Complainant is a party who initiates a lawsuit in a court of law or an administrative proceeding

  • In the context of criminal law, “complainant” refers to a person who alleges that another committed a criminal act against him/her. 
  • In the context of civil law, “complainant” refers to a person or entity filing a complaint.

[Last updated in July of 2022 by the Wex Definitions Team]