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. The JR is currently scheduled into the beginning 2022. Due to the recent facility renewal, we plan to schedule JR expeditions through the end of 2024. The JR is expected to operate in the Equatorial and North Atlantic, Gulf of Mexico, Mediterranean, Caribbean, and the Arctic in 2021 and 2022, and to complete its circumnavigation with a return to the east Pacific region by 2023, the western Pacific by 2023-2024, and potentially the Indian Ocean by the end of 2024. Proposals for these future operational areas are now needed. MSP expeditions are planned to operate once every other year to recover core from targets that are inaccessible by the other facilities (e.g., shallow water, enclosed seas, inland seas). MSP proposals for any ocean are welcomed. Completely new Chikyu riser proposals (other than CPPs) will not be accepted until after publication of a new post-2023 science plan. We also invite proposals that involve drilling on land and at sea through coordination with the International Continental Drilling Program (ICDP). 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. Next submission deadline: October 1, 2019.