PurposeThis review frames the state of agencification studies to explore the development and results achieved to date (Q1: what has been done?) and identify future directions (Q2: what could be done?) of the studies.Design/methodology/approachA systematic approach is carried out to summarize how agencification is adopted, variability of implementation, and its effects, from literature published in the past 48 years (1973–2020). Eligibility criteria include a combination of literature quality (number of citation) and source reputation (journal impact factor). From this, 84 articles and 9 books were included in the review.FindingsThe review finds various country-specific adoptions of agencification and some similarities and differences of agencification practice across various administrative settings. Studies on the effects of agencification is limited and offer mixed results. Meanwhile, little attempt was made to reveal how micro-processes are happening in the everyday practice of agencification. The paper outlines a set of research agenda and possible alternative approaches for future studies.Research limitations/implicationsThis review provides an avenue for scholars and practitioners to pay more attention to the “street level” of agencification. Future studies may challenge New Public Management's view of agencification by proposing new perspectives based on a direct observation.Originality/valueThis study contributes to the growing amount of agencification studies by synthesizing theoretical and empirical works across countries covering developed and developing economies in local, regional, and national levels of government.