The International Ocean Discovery Program (IODP) facilitates international and interdisciplinary research on transformative and societally relevant topics using the ocean drilling, coring, and down-hole measurement facilities JOIDES Resolution, Chikyu, and Mission-Specific Platforms (MSP). Investigators are reminded that the interval from the first proposal submission to expedition scheduling is on the order of 4-5 years due to the science and safety review process and required lead time for scheduling, and that adequate site characterization/site survey data are critical for success. Proponents are strongly encouraged to contact the facility’s science operator to discuss platform-specific operational and fiscal constraints before developing proposals. The IODP Proposal Manager can answer questions about eligibility to submit. Full proposal deadline: April 1, 2022.