After concluding his thesis on Byzantine history at the Sorbonne, Costas M. Stamatopoulos has written a number of articles and studies on the Greek presence in Constantinople and Asia Minor. The following are also among his works (in Greek if not otherwise stated):

Breakthroughs in the Throes of Modern Greece (Domos, 1988); Steps in the Heritage of Constantinople (Domos, 1989, augmented edition 1992); Constantinople, in Search of the Queen of Cities (with Akylas Millas, Bratzioti, 1990); A Lesson in Balkan History (Domos, 1995); The Final Glow: the Greeks of Constantinople in the Years 1948–1955 (Domos, 1996); Aegean Asia Minor (Asterismos, 1998); The Tatoi Chronicle (1800–2003), Vol. I and Vol. II (Kapon, 2004); The Monuments of Mt Penteli (Municipality of Vrilissia, 2007, in association with Alexia Altouvi); Istanbul through the Lens of Achilles Samantzis and Evgenios Dalezios (Allemandi, 2009); Journal of Prince Nicholas (1909–1912) (Fereniki, 2011); Tatoi. A Guided Tour through Time and Space (Kapon, 2011, 2015); Monarchy in Modern Greece (Kapon, 2015, the English and French editions appeared in 2017).

The volumes Sinasos in Cappadocia (1996), to which he contributed a lengthy article on ‘Daily life in Sinasos in the early 20th century’, and Constantinople, in Search of the Queen of Cities have received awards from the Academy of Athens.

To the volume The Building of the Parliament of the Hellenes (Parliament of the Hellenes, 2009) he contributed
the chapters on ‘The Palace in the reign of George I (1863–1909)’ and ‘The slow twilight (1909–1922)’.

Costas M. Stamatopoulos is vice-president of the Hellenic Environment and Culture Society.