We should perhaps say fun learning activities instead, as some students (and some managers) do get turned off by the word games. But whatever you call these activities, a bit of fun, competition and team work can be a powerful motivator for learners.
Here is a selection of grammar, vocabulary and prepositions board games.
The question cards require some cutting up, but you'll want to use them again and again.
Read more: Board games
Here is a selection of board/card games for practising speaking skills, particularly fluency.
Read more: Speaking games
There are lots of free websites with vocabulary, grammar or spelling games which are suitable for EFL students. Here are some of my favourites.
Read more: Language games
If you have an interactive whiteboard in your classroom, try these PowerPoint games. Some are ready to go; some need you to type your own questions into the template.
Read more: PowerPoint games
Follow this link for a paper version of the Blockbusters game, suggestions for words and a PowerPoint version you can use with interactive whiteboards.
Read more: Blockbusters (ABC quiz)
This page is a work in progress for games which I couldn't decide how to categorise.
Read more: Other games