Konstantinos Negris (1804 - 1880; Greek: Κωνσταντίνος Νέγρης) was a writer, mathematician, physicist, and professor.

He was one of the first professors at the newly founded University of Athens and introduced the works of Legendre and Hachette to Greek education, also he was one of the first professors to study abroad; consequently, Greek students continued their studies in France and Germany.

He personally intervened in the education of Greek mathematician Ioannis Papadakis.

Konstantinos attended the prestigious French university known as the École Polytechnique.

Greek physicist Dimitrios Stroumpos also attended the school around the same period.

Konstantinos was exposed to the works of Gaspard Monge, Adrien-Marie Legendre, and Jean Nicolas Pierre Hachette.

He also published the first-ever grammar of the modern Greek language in the United States.

In his autographed letter to the Secretary of Education on July 21, 1836, he proposed to teach descriptive geometry.

The applied mathematics taught in early Greek education was used for civil engineering, astronomy, mechanics, architecture, fortification, and navigation.

He helped Greek mathematician Ioannis Papadakis study abroad.

[8] In the year 1843, in the month of September, the people were unsatisfied with the foreign monarch chosen to lead the new nation.

He stopped teaching in 1845 and continued to assist the newly founded Greek state diplomatically.