This tutorial on Bioinformatics for Mass spectrometry analysis was part of a full series of tutorials that I have organised in 2009 while sitting in the Educational Committee of the European Proteomics Association (EuPA). Some information on bioinformatics tools would need to be verified, but the core of slides is still up to date. It introduces the basic ideas behind mass spectrometry and bioinformatics for protein identification from mass spectrometry data.