EU43 may refer to:

• EU43 (electric locomotive), a class of electric multisystem locomotives similar to FS Class E412 ordered by Polish State Railways but today used in Italy
• EU43, a class of Bombardier TRAXX locomotives used by Polish State Railways

• Marek Mazanec
• Marek Maďarič
• Marek Mašlonka
• Marek Melenovsky
• Marek Melenovský
• Marek Napiorkowski
• Marek napiórkowski
• Marek Napiórkowski
• Marek Niedzwiecki
• Marek Niedźwiecki
• Marek Niedźwiedzki
• Marek Obrtel
• Marek Obrtel(lieutenant colonel)
• Marek Ondrik
• Marek Ondrík
• Marek Oravec
• Mareko (woreda)
• Marek Pach
• Marek Pavelec
• Marek Petrusewicz
• Marek Pienkowski
• Marek Piotrowski vs. Don Wilson
• Marek Pittner
• Marek Postulka
• Marek Poštulka