Disasters and climate-related risks displace millions of people each year. Planned relocation is one strategy used to address displacement. However, little attention has been paid to the secondary impacts of planned relocations, and how they influence the risk, vulnerability, and well-being of other groups, particularly people who live on the land selected for relocation sites, or in neighbouring areas. This paper explores how current and potential planned relocations in Fiji and the Philippines redistribute vulnerabilities to non-target communities that previously lived on, or alongside, relocation site land. The notion of cascading displacement is introduced to illustrate a serious consequence of planned relocations in which insecurity and displacement are recreated and perpetuated due to a failure to consider the needs of non-target groups that are directly disadvantaged by relocation processes. Insights from this paper may be used to inform future relocation policy and practice to achieve more equitable and sustainable outcomes for all involved.