5.1. Introduction to fatigue of fibres5.2. Experimental methods for characterization of fatigue behaviour of fibres5.3. Fatigue analysis of glass fibres5.4. Fatigue analysis of carbon fibres5.5. Fatigue analysis of other types of fibres5.6. Modelling of fatigue strength of fibres and bundles5.7. Effect of environmental factors on the fatigue behaviour of fibres5.8. Conclusions and future challenges