A mobile computerised system for handling the activities and services of the library provides a comprehensive way to lessen physical labour, reduce human error and grant access to information materials anywhere and anytime. This research work aimed to design and implement an Android Mobile Library Management System that university libraries can use to overcome the human and other challenges that prevent them from providing services on the go. The research work was guided by four objectives and four research questions. The Android Mobile Library Management System was designed and implemented using the Android Studio which contains XML (Extensible Mark-Up Language) and Java. At the back-end HTML (Hypertext Mark-Up Language), CSS (Cascading Style Sheet), PHP (PHP Hypertext PreProcessor) and MySQL database were used. The system was tested after the development and found suitable to meet all the requirements specified. The system has capacity to add to the integrity of the library, ease the activities of the librarian and eliminate the stress related with the current process of searching for library books.