What is Lojban?

Lojban is a spoken logical language that was created in 1987 and is now supported by its speakers.

This website lists unofficial free libre tutorials and documentation on the Lojban language.

‘Learn Lojban’ course

This course teaches Lojban from its formal foundations, but in simple terms and with plenty of usage examples.

  • PDF - in a PDF file for download.

Live Lojban chat

in the Discord, Telegram messengers.

Unofficial ‘Complete Lojban Language’ Book, October 2022 Edition

This book adheres to the original book published in 1997 and:

  • Fixes mistypes
  • Fixes contradictions
  • Adds new content that does not violate previous content

It is available in the following formats:

More info...

la sutysisku - a slick unofficial dictionary

Explore La Sutysisku, a dictionary for Lojban that includes:

  • De facto standard definitions of words
  • Experimental definitions and usage examples


You can send any suggestions to gleki.is.my.name@gmail.com or add issues at the Lojban source repository.


The license for the ‘Complete Lojban Language’ book (a rather permissive one) is specified in the book itself.

Public Domain Mark
This work (Learn Lojban, by Gleki Arxokuna), identified by Gleki Arxokuna, is free of known copyright restrictions.

Notable pages