---
id: "complainant"
kind: "glossary-term"
title: "complainant"
language: "en"
category: "Rights protection and disputes"
updated: "2026-10-04T14:01:23Z"
canonical: "https://tldlog.com/glossary/complainant/"
translations:
  es: "https://tldlog.com/es/glosario/demandante/"
  de: "https://tldlog.com/de/glossar/beschwerdefuehrer/"
  fr: "https://tldlog.com/fr/glossaire/requerant/"
  it: "https://tldlog.com/it/glossario/ricorrente/"
  pt-BR: "https://tldlog.com/pt/glossario/reclamante/"
  ru: "https://tldlog.com/ru/glossariy/istets/"
  zh-Hans: "https://tldlog.com/zh/cihui/tousuren/"
---

# complainant

The party that starts a domain dispute by filing a complaint, usually a trademark owner who says a domain name abuses its mark. Under the UDRP the complainant must prove its case and pays the provider's fee. If the respondent asks for a three-member panel, it pays half the fee.

## related terms

- [respondent](https://tldlog.com/glossary/respondent/)
- [UDRP](https://tldlog.com/glossary/udrp/)
- [UDRP elements](https://tldlog.com/glossary/udrp-elements/)
- [panel](https://tldlog.com/glossary/udrp-panel/)
- [RDNH](https://tldlog.com/glossary/reverse-domain-name-hijacking/)