E-Government aims to deliver benefits to government and citizens by improving transparency, efficiency, trust, and citizen participation. However, e-government initiatives face several barriers. One of them is poor usability. To advance quality of usability, literatures indicate that usability evaluation is a key success factor. There are many approaches to conduct usability evaluation. Each of it has advantages and challenges. On the other hand, there are several aspects that must be considered related to usability evaluation in e-government context. It includes large stakeholders and their diversity, extra needs for ethical practices, as well as high privacy. Therefore, it is crucial to investigate the right usability evaluation method in e-government. In order to address this issue, a study using Systematic Literature Review (SLR) was conducted to identify the suitable usability evaluation methods. There are 519 literatures that have been selected in the initial stage. It was then followed by an extraction process, which produced 22 selected references. Each method was grouped into usability testing, inspection, and inquiry. These results can guide academics and practitioners to carry out usability evaluation in egovernment.