Objectives: Research on unretirement (retirees who re-enter the workforce) is burgeoning. However, no longitudinal study has examined how informal care relates to unretirement. Utilizing role theory, this study aims to explore the heterogeneity of informal care responsibilities in retirement and to examine how informal care informs re-entering the workforce in later life.; Method: Data were drawn from the Health and Retirement Study of fully retired individuals aged 62 years and older in 1998 (n = 8,334) and followed to 2008.