Great Army may refer to:

• Grande Armée, army commanded by Napoleon during the Napoleonic Wars in the 19th century
• Great Heathen Army, coalition of Norse warriors that originated from Sweden, Norway, and Denmark in the 9th century

• Vernon, Ontario
• Vernon Oswald Marquez
• Vernon O. Underwood Stakes
• Vernon Oxford
• Vernon Paris
• Vernon Parish School Board
• Vernon Parish School District
• Vernon Parker
• Vernon Patrick Boot
• Vernon Porter
• Vernon Prichard
• Vernon Pyles
• Vernon Reed
• Vernon Regional Transit
• Vernon Regional Transit System
• Vernon Rice award
• Vernon Rice Award
• Vernon River Consolidated School
• Vernon River (Georgia)
• Vernon River, Prince Edward Island
• Vernon Robertson
• Vernon Rockville, Connecticut
• Vernon Rosario
• Vernon Rosario II
• Vernon Ruttan