Carl Jessen may refer to:

• Carl Ludwig Jessen (1833–1917), North Frisian painter
• Carl Wilhelm Jessen (1764–1823), Danish naval officer and governor of St Thomas

• Unio Itineraria
• Unio Korfbalera Sant Adria de Besos
• Uniola latifolia
• Unio Mallorquina
• Unio mystica
• Union 06 Oberschöneweide
• Union (1802 ship)
• Union 38 School District
• Union 76
• Union A
• Union Academique International
• Union Academy (Macon County)
• Union Academy (Macon County, NC)
• Union Academy (Macon, NC)
• Union Academy (Macon NC)
• Union Academy (Monroe, North Carolina)
• Union affiliate
• Union affiliate votes
• Union affiliation by US state
• Union affiliation by U S state
• Union affiliation by U. S. state
• Union Africaine et Malgache
• Union Africaine et Malgache de Cooperation Economique
• Union Agua Blanca District
• Union Airport (Nebraska)