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- Andrew S. Tanenbaum – operating systems, MINIX
- Bernhard Thalheim – Conceptual modelling foundation
- Éva Tardos
- Gabor Tardos
- Robert Tarjan – splay tree
- Jaime Teevan
- Shang-Hua Teng – analysis of algorithms
- Larry Tesler – human-computer interaction, graphical user interface, Apple Macintosh
- Avie Tevanian – Mach kernel team, NeXT, Mac OS X
- Bruce H. Thomas – wearable computers, augmented reality
- Ken Thompson – Unix
- Sebastian Thrun – AI researcher and inventor of autonomous driving
- Walter F. Tichy – RCS
- Seinosuke Toda – computation complexity, recipient of 1998 Gödel Prize
- Linus Torvalds (1969-∞) – Linux kernel, Git
- Godfried Toussaint – computational geometry – computational music therory
- Joseph F Traub – computational complexity of scientific problems
- John Tukey – FFT
- Murray Turoff – computer-mediated communication
- Alan Turing (1912–1954) – British computing pioneer, Turing Machine, algorithms, cryptology, computer architecture.
Read more about this topic: List Of Computer Scientists