Learning English Online (LEO) is a guide to internet resources for learners of English as a Second or Foreign Language (ESL/EFL). Teachers will also find it useful as a source of online English-learning material for their students.

The guide contains over 700 links to online resources, and is divided into 34 sections, covering not only core topics such as Listening, Speaking, Reading, Writing, Grammar, and Vocabulary, but also less obvious ones such as Twitter, YouTube and Apps, as well as a section on How to Learn English.

Each section is preceded by a short introduction to the topic, and the guide also contains numerous tips for improving one's level of English.