Objective: We aimed to clarify the content of different types of regrets or lack of regret, and the frequency of feeling regret among family caregivers who assisted their relatives during their end of life stage. Method: Seventy primary informal caregivers in Israel were interviewed (17 spouses, 52 children, and 1 cousin) concerning their regret about the end of life of their deceased relative, including a general question about regret and questions about regret concerning life-sustaining treatments. After calculating the frequency of regrets and lack of regret, we conducted a qualitative analysis, using a thematic approach to identify themes and interpret data. Results: A majority of caregivers (63%) expressed regret and about 20% expressed ambivalence involving both regret and denial of regret. Regrets pertained to care given, suffering experienced, and the caregiver's behavior towards, and relationship with the deceased, including missing opportunities to express love and caring toward relatives. Caregivers viewed almost 30% of 75 administered life-sustaining procedures as misguided. Most regrets involved inaction, such as not communicating sufficiently, or not fighting for better care. Conclusion: This article provides a comprehensive description of EoL regrets, and helps clarify the complexity of regrets, lack of regrets, and ambivalence concerning regrets, though the study is limited to one country. Analysis suggests the need for public education concerning the EoL process, and for changes within the health care system to improve communication, to improve understanding of the needs of the terminally ill, and to provide more instruction to family caregivers to help them understand EoL.