The International Ocean Discovery Program (IODP) explores Earth’s climate history, structure, mantle/crust dynamics, natural hazards, and deep biosphere as described in the IODP Science Plan Illuminating Earth’s Past, Present, and Future. IODP facilitates international and interdisciplinary research on transformative and societally relevant topics using the ocean drilling, coring, and downhole measurement facilities JOIDES Resolution (JR), Chikyu, and Mission Specific Platforms (MSP). Proposals are being actively sought for all three facilities. We also invite proposals that involve drilling on land and at sea through coordination with the International Continental Drilling Program (ICDP) and a new submission and joint review process. 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 Science Operators to discuss platform-specific operational and fiscal constraints before developing proposals. The next submission deadline (following October 21, 2020) will be in early April, 2021.