On behalf of the Tunisian Crystallography Association (Association Tunisienne de Cristallographie), it is our great pleasure to invite you to participate on the Forth Tunisian Crystallographic Meeting (TCM4-2014) which will be held during November 2-5 2014 at El Mouradi Djerba Menzel All inclusive in the nice lotophage island of Djerba, in the South of Tunisia. For those who have never been in Tunisia, we would like to stress it is a charming country with a very long history of 20 centuries heritage from Phoenician, Roman, Christian, Berber and Islamic civilizations. This meeting provides an opportunity for young researchers to present their work, discuss about crystallography, physics, chemistry, biology, geology, and cooperation at national, regional or international levels.