Small island developing states (SIDS) are recognised as “particularly” vulnerable to the effects of climate change, and accordingly receive relatively high levels of adaptation assistance as a group. We here analyse bilateral and multilateral adaptation aid committed to SIDS between 2009 and 2018, as reported in the OECD Creditor Reporting System (CRS) to better understand the overall evolution of adaptation aid for SIDS, allocation patterns across regions, countries and sectors, as well as the sources and channels of this aid. Since 2009, more and more aid has gone into adaptation: overall, donors pledged $6.6 billion for adaptation in SIDS between 2009 and 2018, and supported a wide variety of projects, mainly through grants.