Mobile government enhances public sector activities by using mobile technologies, such as handheld devices, smartphones, and laptops that promise anytime, anywhere services. Mobile government solutions are successful if many users adopt them. For this reason, the determinant factors of adoption are extremely important. Despite many studies conducted by various researchers in the field of mobile government adoption, most have focused on technology or e-government adoption models as their basis. To fill this gap, the paper collects possible driving factors, grouped into key factors, for mobile government adoption. The systematic literature review, which included 54 journal articles, led to the identification of 12 key factors affecting mobile government adoption, comprising 87 components. Some of these replicate previously identified factors in technology and e-government adoption models, yet the literature presented us with new specifics in mobile and government, such as the benefits that mobility brings and the influence of trust on adoption.