Demetrios Kokkidis (Greek: Δημήτριος Κοκκίδης; November 4, 1840 – February 11, 1896) was an astronomer, mathematician, physicist, professor, and dean.

Kokkidis was the fourth president of the Athens Observatory after the death of Johann Friedrich Julius Schmidt.

From a young age, Demetrios showed signs of higher intelligence and attracted the attention of Greek entrepreneur and philanthropist Simon Sinas.

[7] His professor was world-renowned astronomer Johann Franz Encke; Demetrios was also affiliated with Karl Christian Bruhns while he was at the Observatory.

He completed a dissertation in 1862 entitled: Variations of the Declinations of the Stars θ Ursa Major and β Draco (Variationibus Declinationum Stellarum θ Ursae Majoris et β Draconis) afterward he continued his studies in Paris until 1877 occasionally returning to Greece.

Demetrios also taught geodesics, astronomy, and higher mathematics at Evelpidon and the Hellenic Naval Academy following the footsteps of his father Kosmas.

During his tenure, he wrote countless articles in the field of astronomy and expanded the existing weather stations adding ones in Corfu, Zakynthos, and Larissa.

He received the Order of the Redeemer from the Greek state and similar awards from Spain and Prussia for his contribution to astronomy.

The Parnassos club is now housed in a private mansion on St. George Square designed by his brother Ifikratis Kokkidis.