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). The number of proposals, at all stages of development, currently in the system for the JOIDES Resolution provide many high-quality options for scheduling the ship through the end of the current program and into 2024; therefore, we are not requesting new pre-proposals or full proposals. We will accept revisions to pre-proposals and full proposals already in the system, new Ancillary Project Letters (APLs), new Land-2-Sea proposals, and submission of proposals that were deactivated in 2020 with an encouragement to revise and re-submit. Deadline: April 1, 2021.