Chicken feather is an increasing abundant organic solid waste containing high concentration of keratinous protein. Disposal of this huge volume of waste has always been an issue of concern for poultry industry. Therefore, energy and material recovery of this valuable protein resource is an important field of waste treatment and bioenergy generation. Anaerobic digestion is an environmentally and economically promising alternative process for sustainable biogas production of feather waste. Furthermore, application of appropriate pretreatment methods would enhance biogas potential of chicken feather.