EuroCG is an annual workshop that combines a strong scientific tradition with a friendly and informal atmosphere. The workshop is a forum where established researchers and students can meet, discuss their work, present their results, and establish scientific collaborations. The goal is to present recent results and to identify and explore directions for future research. The 40th edition of the European Workshop on Computational Geometry (EuroCG2024) will be held at March 13-15, 2024 at the University of Ioannina in Greece.