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OpenfMRI is an open-science neuroinformatics database storing datasets from task-based functional magnetic resonance imaging (fMRI) research studies.
The database is available online. Neuroimaging researchers, having performed an fMRI study, may upload their neuroimaging data to the site. Third-party researchers may download the data and use it, e.g., for re-analysis.
OpenfMRI was predated by two other online neuroimaging databases: fMRI Data Center (fMRIDC) and the 1000 Functional Connectomes Project (FCP), available via the Neuroimaging Informatics Tools and Resources Clearinghouse Image Repository. The fMRIDC collected the same type of data as OpenfMRI, but distributes it via physical media. It no longer accepts data submissions. FCP collected data from resting-state fMRI studies.
OpenfMRI is run by the research group around Russell Poldrack, and they described the system in the scientific article Toward open sharing of task-based fMRI data: the OpenfMRI project from 2013, and later in OpenfMRI: Open sharing of task fMRI data from 2015.