Richelieu
- Alphonse-Louis du Plessis de Richelieu
- Andreas du Plessis de Richelieu
- Armand-Emmanuel du Plessis, Duc de Richelieu
- Canada Steamship Lines
- Cardinal Richelieu
- Duke of Richelieu
- Emmanuel-Armand de Richelieu, duc d'Aiguillon
- French ship Richelieu
- George Payne Rainsford James
- Louis François Armand du Plessis, duc de Richelieu
- Oxford shoe
- Richelieu (1914 film)
- Richelieu (2023 film)
- Richelieu (Province of Canada electoral district)
- Richelieu (federal electoral district)
- Richelieu (play)
- Richelieu (provincial electoral district)
- Richelieu Levoyer
- Richelieu River
- Richelieu River (Montmorency River tributary)
- Richelieu, Indre-et-Loire
- Richelieu, Kentucky
- Richelieu, Quebec