There is renewed interest in collecting EEG in large cohort studies. Several cohort studies within ENIGMA‐EEG have initiated the collection of EEG recordings in samples of over 1,000 participants, using newer EEG equipment and higher density electrode montages. These include cohorts from Germany (LIFE cohort) and the United States (The Tennessee Synchrony & Speech Cohort). These high‐quality, high‐density recordings provide additional opportunities to investigate the relation between EEG and psychiatric/neurological disorders. Most of the ENIGMA‐EEG cohorts are population‐based samples, while some are samples ascertained for psychiatric disorders or epilepsy.