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- Elon Gasper - co-founded Bright Star Technology, patented realistic facial movements for in-game speech. HyperAnimator, Alphabet Blocks, etc.
- Bill Gates - Altair BASIC, co-founded Microsoft
- Steve Gibson - creator of SpinRite
- John Gilmore - GDB
- Adele Goldberg - co-creator of Smalltalk
- Ryan C. Gordon (a.k.a. Icculus) - Lokigames, ioquake3, MojoSetup, etc.
- James Gosling - Java, Gosling Emacs, NeWS
- Bill Gosper - Macsyma, Lisp machine, hashlife, helped Donald Knuth on Vol.2 of The Art of Computer Programming (Semi-numerical algorithms)
- Andrew Gower - RuneScape Classic, RuneScape, co-founded Jagex
- Paul Gower - RuneScape Classic, RuneScape, co-founded Jagex
- Paul Graham - Yahoo! Store, On Lisp, ANSI Common Lisp
- John Graham-Cumming - author of POPFile, a Bayesian filter-based e-mail classifier
- Ralph Griswold - co-creator of SNOBOL, creator of Icon (programming language)
- Richard Greenblatt - Lisp machine, Incompatible Timesharing System, MacHack
- Scott Guthrie, (a.k.a. ScottGu) - ASP.NET Creator
- Andi Gutmans - co-creator of PHP programming language
Read more about this topic: List Of Programmers