The Citadel Group Limited, a software and services company, develops and offers software platforms, digital services, and managed services and solutions in Australia and internationally. The company primarily offers term managed, software as a service, product sales and installation, consulting, and professional services. It also offers education, specialist consulting and human resources, technology and integration, knowledge management and advisory, systems integration and software development, data management, and information and communications technology managed services, as well as oncology patient management software. Additionally, the company offers radiology and maternity workflow solutions, and health software services. It serves customers in the e-health, defense and national security, government, and tertiary education sectors. The company operates in five segments that includes health, technology, enterprise solutions, professional services, and wellbeing. The Citadel Group Limited was founded in 1995 and is based in Melbourne, Australia with additional offices in Beverley, Sydney, Brisbane, Canberra City, Melbourne, and Australia and Mansfield, United Kingdom. As of May 11, 2023, The Citadel Group Limited operates as a subsidiary of Magentus Group Pty Limited.