Abstract• Purpose: Governments create large amounts of data. However, the publication of open data is often cumbersome and there are no standard procedures and processes for opening data. This blocks the easy publication of government data. The purpose of this paper is to derive design principles for improving the open data publishing process of public organizations.• Design/methodology/approach: Action Design Research (ADR) was employed to derive design principles. The literature was used as a foundation, and discussion sessions with civil servants were used to evaluate the usefulness of the principles.• Findings: Barriers preventing easy and low-cost publication of open data were identified and connected to design principles, which can be used to guide the design of an open data publishing process. Five new principles are 1) start thinking about the opening of data at the beginning of the process, 2) develop guidelines, especially about privacy and policy sensitivity of data, 3) provide decision support by integrating insight in the activities of other actors involved in the publishing process, 4) make data publication an integral, well-defined and standardized part of daily procedures and routines, 5) monitor how the published data are reused.• Research limitations/implications: The principles are derived using ADR in a single case. A next step can be to investigate multiple comparative case studies and detail the principles further. We recommend using these principles to develop a reference architecture.• Practical implications: The design principles can be used by public organizations to improve their open data publishing processes. The design principles are derived from practice and discussed with practitioners. The discussions showed that the principles could improve the publication process.