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- Andre LaMothe- LaMothe is the creator of the XGameStation,one of the world's first video game console development kits
- Tom Lane - primary author of libjpeg, major developer of PostgreSQL
- Leslie Lamport - LaTeX
- Butler Lampson - QED original co-author
- Sam Lantinga - creator of SDL
- Dick Lathwell - co-developer of APL\360
- Chris Lattner - primary author of Low Level Virtual Machine project
- Samuel J Leffler - BSD, FlexFAX, libtiff, FreeBSD Wireless Device Drivers
- Rasmus Lerdorf - original creator of PHP
- Michael Lesk - Lex
- Gordon Letwin - Architect of OS/2, author of HPFS file system
- Rockford Lhotka - Creator of the CSLA framework
- Håkon Wium Lie - co-author of Cascading Style Sheets
- Robert Love - Linux kernel developer
- Ada Lovelace - First programmer (of Charles Babbages' Analytical Engine)
- Al Lowe - creator of Leisure Suit Larry series
Read more about this topic: List Of Programmers