Plaignant vs. Demandeur

11:55 Mar 19, 2021 

Cette source pourra vous être utile pour le type de question que vous venez de poser :
https://www.dictionnaire-juridique.com/definition/demandeur....
Votre question ne comporte aucun contexte, ce qui est dommage. Il serait déjà bon savoir quel point vous souhaitez élucider avant de donner une réponse satisfaisante pour vous ! Sinon nous allons déclencher une séance de cours de droit...
En droit pénal, les affaires ne sont pas systématiquement déclenchées par une plainte, puisque le parquet intervient d'office. Si bien que dans un procès pénal, on aura surtout des "victimes", qui peuvent accessoirement être des "parties civiles". D'ailleurs, l'excellent dictionnaire Braudo que je viens de vous recommander n'a pas d'article sur le "plaignant".

14:47 Mar 18, 2021 

The additional information was intended to assist you as I assumed that you are most probably translating into English. Your question is posited as English to French which is confusing - should I reverse the pair?

14:33 Mar 18, 2021 

Thank you for taking the time. The question was clearly posed for Plaignant vs. Demandeur as used in the French Court system (civil or criminal), so I fail to see the relevance of some of these answers. I did not ask for use in USA, or UK ....

14:33 Mar 18, 2021 

In some civil and administrative contexts, Petitioner would be the right term for Demandeur or Requérant.
https://legal-dictionary.thefreedictionary.com/petitioner

14:17 Mar 18, 2021 

The ECHR is VERY different to national courts and a complete exception to the norm because it's not a court of first resort.
In almost all civil cases commenced in UK, USA etc. you will inevitably see plaintiff or claimant vs. defendant. Different terms are frequently used in divorce cases, interlocutory applications, appeals etc.

08:38 Mar 18, 2021 

For exemple, ECHR always uses the term "applicant" refering to "demandeur" or "requérant" and never uses the term "plaintiff" nor "claimant". See the recent following decision hold by ECHR vs. United Kingdom:

http://hudoc.echr.coe.int/fre?i=001-186048

01:05 Mar 18, 2021 

Plaintiff and Applicant rarely if ever have the same meaning

21:48 Mar 17, 2021 

Thank you Laurent, that was precisely what I was asking. Merci

20:14 Mar 17, 2021 

Both terms have the same meaning:
Plaignant = Demandeur
Plaintiff = Applicant
"Plaignant" is mostly used in criminal matters before French criminal courts.
"Demandeur" is mostly used in civil matters before French civil courts.