Feeling guilty and anxiety are part of the most important human experiences, especially in the elderly, which can affect their mental health. Hence, identifying the factors that affect them is of particular importance. Therefore, this study aimed to predict feeling guilty and anxiety based on existential concerns in the elderly. The present study was a descriptive study, of correlational type. The statistical population included non-resident elderly in the nursing homes of districts one, three, and five of Tehran, Iran in 2019, among which a sample of 150 people were selected using convenience sampling method. The research tools included existential anxiety questionnaire (Massoudi Sani et al.,) guilt inventory (Kugler & Jones) and Anxiety I...