There are multiple definitions - click on the translation that matches your context.

Klage

Substantiv

full

complaint

noun

Comparative law notes

Germany

In some contexts, the term "Klage" will be used to denote the initial written submission (pleading) filed with the court to initiate the procedure. In that case, "complaiint" would be the more appropriate translation choice (for US readers).

Definitions of complaint

English

the document submitted to the court by a claimant to start a civil legal action

She filed her complaint with the District Court.