As with many occupations, computers and technology have become vital parts of working life. With hotel management, computers can be used to record, report and analyze the effectiveness of internal operations such as reservations, registration, guest history, guest accounting audit, and back-office accounting, thereby bringing a variety of benefits including ample amount of memory, advanced communication, advanced functioning among others. In view of these, this study design and develop an online-based hotel information system for University of Benin Guest House, Benin City, Edo State. The system is met to automate data entry methods; ensure efficient and reliable communication within the Guest House and enable fast and easy retrieval of guest records and data for fast reference activities. The Unified Modelling Language (UML) was used to model the system architecture and design, while the software was developed using PHP and MySQL. Also provided in this report is a description of the software design and implementation requirements.