Laurentian (French: Laurentides or Laurentien) may refer to:

• Anything related to Saint Lawrence or the Saint Lawrence River
• Laurentia, the craton at the heart of the North American continent
  • The exposed parts are also known as the Canadian Shield, the Laurentian Shield or the Laurentian Plateau.
• The Laurentian Abyss or Abyssal - a trench off the eastern coast of Canada
• The Laurentian (or "Northern") Continental divide
• The Laurentian mountains in Quebec
• The Laurentides Region in Quebec
• Laurentian, Ontario
• The Borough of Laurentien in Quebec City, Quebec
• Laurentian University in Sudbury, Ontario
• The Laurentian Bank of Canada
• The Laurentian language, a language in the Iroquoian family of languages.
• Laurentian Codex, a Russian manuscript