Ernst Moritz Theodor Ziller (Greek: Ερνέστος Τσίλλερ, Ernestos Tsiller (22 June 1837 – 4 November 1923) was a German born university teacher and architect who later became a Greek national. In the late 19th and early 20th centuries, he was a major designer of royal and municipal buildings in Athens, Patras, and other Greek cities. 
Ziller was born in the rural community of Serkowitz in the district of Radebeul in Saxony. After graduating from the Dresden Academy of Fine Arts in 1858, he went to work for Danish architect Theophilus Hansen. In 1861, Hansen sent him to Athens. In 1872 he was appointed a professor at the Royal School of Arts, now National Technical University of Athens. He was married to a Greek wife. His daughter Iosifina Dimas-Ziller (1885-1965) was an impressionist painter. In 1885, he designed a three story mansion where his family resided until 1912. Now known as the Ziller-Loverdos-Villa, the residence was later acquired by Greek banker Dionysios P. Loverdos (1878–1934). Ziller died in Athens and was buried at the First Cemetery of Athens. 
- Andreas Syngros mansion (now Ministry of Foreign Affairs (Greece))
- Church of Saint Luke
- Hotels "Megas Alexandros" and "Bakeion", Omonoia Square
- Iliou Melathron (now Numismatic Museum of Athens)
- Melas Mansion
- National Chemistry of Greece
- National Theatre of Greece
- Old building of the Hellenic Military Academy
- Old headquarters building of the National Bank of Greece
- Peloponnese Railway Station
- Presidential Mansion
- Stathatos Mansion
- Thon mansion (destroyed during the Dekemvriana)
- Villa Atlantis
- Loverdo Museum (Academy Street 58a)
- Transfiguration of Jesus church in Vilia, West Attica
- Royal palace in Tatoi
- Archaeological Museum of Aigion (old Municipal market)
- Cathedral Church of Panagia Faneromeni
- Church of Esodia of Theotokos
- Church of St. Andrew
- Municipal Market of Argos
- Archaeological Museum of Pyrgos (old Municipal Market)
- Municipal Theater of Pyrgos
- Old City Hall
- Railway station of Pyrgos
- Ermoupolis City Hall
- Greek consulate in Thessaloniki (today Museum for the Macedonian Struggle)
- Metropolitan Church of Saint Gregory Palamas
- "The Architect Ernst Ziller". imma.edu.gr. Retrieved November 1, 2019.
- Alexandra Koroxenidis. "Ernst Ziller's magnificent architecture". ekathimerini.com. Retrieved November 1, 2019.
- "Theophilus Edvard Hansen, 1813-91, Arkitekt". Dansk biografisk Lexikon. Retrieved May 1, 2019.
- "Ernst Ziller biography". presidency.gr. Retrieved November 1, 2019.
- Ernst Ziller. "The Importance of Being Ernst". portesmagazine.com. Retrieved November 1, 2019.
- "Ziller-Loverdos mansion was fully restored and opened to public". ered.gr. Retrieved November 1, 2019.
- Friedbert Ficker (2003) Ernst Ziller – ein sächsischer Architekt und Bauforscher in Griechenland: Die Familie Ziller Taschenbuc ( Allgäu : Der Kunstverlag Josef Fink) ISBN 978-3898700764
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