Digitization and automation across all industries has resulted in improvements in efficiencies and effectiveness to systems and process, and the higher education sector is not immune. Online learning, e-learning, electronic teaching tools, and digital assessments are not innovations. However, there has been limited implementation of online invigilated examinations in many countries. This paper provides a brief background on online examinations, followed by the results of a systematic review on the topic to explore the challenges and opportunities. We follow on with an explication of results from thirty-six papers, exploring nine key themes: student perceptions, student performance, anxiety, cheating, staff perceptions, authentication and security, interface design, and technology issues. While the literature on online examinations is growing, there is still a dearth of discussion at the pedagogical and governance levels.