Leonidas John Guibas (Greek: Λεωνίδας Γκίμπας) is the Paul Pigott Professor of Computer Science and Electrical Engineering at Stanford University.

[3] Guibas is a Fellow of the ACM[4] and the IEEE,[5] and was awarded the ACM - AAAI Allen Newell Award for 2007 "for his pioneering contributions in applying algorithms to a wide range of computer science disciplines.

[8] The research contributions Guibas is known for include finger trees, red–black trees, fractional cascading, the Guibas–Stolfi algorithm for Delaunay triangulation, an optimal data structure for point location, the quad-edge data structure for representing planar subdivisions, Metropolis light transport, and kinetic data structures for keeping track of objects in motion.

More recently, he has focused on shape analysis and computer vision using deep neural networks.

He has Erdős number 2 due to his collaborations with Boris Aronov, Andrew Odlyzko, János Pach, Richard M. Pollack, Endre Szemerédi, and Frances Yao.