BACKGROUND Self-criticism refers to a series of persistent and negative self-judgements, often involuntary, that an individual makes about themselves. Recent research has explored the possibility that self-criticism can lead to a more perseverative style of thinking called self-critical rumination. There is evidence that self-critical rumination may be a separate construct from other forms of rumination, such as depressive rumination and post-event processing. Research has indicated that metacognitions, beliefs that individuals have about their internal experiences and how to control them, may play a role in self-critical rumination. The aim of our work was to develop a measure to assess metacognitions related to self-critical rumination. METHOD In Study 1, a community sample of 178 participants completed the newly developed Metacognitions about Self-Critical Rumination Questionnaire (MSCRQ) and results were subjected to a Principal Components Analysis. In Study 2, a community sample of 247 participants completed a battery of questionnaires including the MSCRQ. A Confirmatory Factors Analysis was performed on the MSCRQ and validity was ascertained by correlating with other measures. RESULTS In Study 1, a 15-item two-factor structure was identified. A 10-item two-factor structure was confirmed in Study 2. Results also indicated that the MSCRQ has acceptable levels of reliability, and good concurrent and incremental validity. CONCLUSIONS The MSCRQ appears to be a reliable and valid measure of metacognitions about self-critical rumination whilst the MCQ-30 is a better predictor of general emotional distress.