This article introduces a dataset on ministerial tenure in Papua New Guinea (PNG). The dataset, which spans from 1972 to 2017 and covers 15 governments and 321 ministers, is used to study ministerial duration and stability. To do this, two measures of ministerial dura-tion and two stability indicators have been developed. These measures show that ministerial instability is high in PNG but it has not become worse over time. They also show, however, that instability has varied consid-erably between governments. Drawing on PNGÊ¼s polit-ical history, this article provides a discussion of this variation by examining the circumstances of particular governments.