There are many different types of cooling towers but majority of them are working on principle of evaporative cooling and dry cooling for industrial applications. However, some special cooling towers, utilised in industries for specific applications are also dealt briefly.The book has coverage of different type of cooling towers in aspect of construction, theoretical concepts, thermal design and installation, operation and maintenance, trouble investigation & situation analysis of cooling towers trouble spots. Effort has been made to make the book practical oriented for engineers working in power and process plants. The book has wide coverage about classifications, constructional features & tower characteristics, material of construction of important components, orientation of towers for optimum effectiveness and efficiency. The Air Cooled Cooling towers (ACC) being the demand of the day is dealt briefly in reference to design, selection, construction, characteristics, operation and maintenance. Trouble diagnosis and trouble shootings are presented in tabulated form for easy understanding.Water conditioning and control being a critical activity in maintaining high reliability cooling tower operation has been discussed separately. Mechanical, Electrical and instruments related maintenance activities for cooling towers are discussed in chapter Maintenance.