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). All three IODP facilities are now encouraging new proposals. The JR is currently scheduled into early 2020. 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 Indo-Pacific region by 2023. Proposals for these future operational areas are strongly encouraged. MSP expeditions are planned to operate once per year on average to recover core from targets that are generally inaccessible by JR and Chikyu. MSP proposals for any ocean are welcomed. To encourage exciting Chikyu expeditions in the future, new pre-proposals for both riser and non-riser operations will be considered. Next proposal deadline: October 1, 2018.