A neuroimaging database consisting of 102 synesthetic brains (and a smaller, N=25, sample of non-synesthetes) using 3T MRI protocols from the Human Connectome Project (HCP). Images processed through the HCP version 4.3.0 pipeline consist of Freesurfer surface reconstructions, rfMRI data (1952 timepoints), subject-specific parcellations (MSMAll), subject-specific node timeseries, and subject-specific parcellated connectomes. Raw data in HCP format are also included to allow re-running of HCP processing with future versions of the pipeline.