Seven, BerfinHatun, OsmanDemirci, Ibrahim2026-04-252026-04-2520260022-39801940-1019https://doi.org/10.1080/00223980.2025.2534802https://hdl.handle.net/11486/8358This study aimed to examine the relationship between psychological flexibility and ontological well-being among adults. The participants consisted of 477 adults aged 18 to 65 years (M = 25.84, SD = 7.62), recruited through convenience sampling. Data were collected using a demographic information form, the Psychological Flexibility Scale, and the Ontological Well-Being Scale. Pearson correlation analysis, multiple regression analysis, and independent samples t-tests were conducted to analyze the data. The results indicated that psychological flexibility was positively associated with ontological well-being. Furthermore, male participants and those who were married or in a romantic relationship reported higher levels of psychological flexibility and ontological well-being. Additionally, even after controlling for age, gender, relationship status, and socioeconomic status, the sub-dimensions of psychological flexibility significantly predicted ontological well-being. The strongest predictors of ontological well-being were the defusion, acceptance, and present-moment-awareness sub-dimensions of psychological flexibility, respectively. In conclusion, interventions aimed at enhancing psychological flexibility may contribute significantly to improving ontological well-being among adults.eninfo:eu-repo/semantics/closedAccessPsychological flexibilityontological well-beingpositive psychologyadultsArticle160215117210.1080/00223980.2025.2534802407534692-s2.0-105012468086Q1WOS:001542637700001Q10000-0001-8408-72860009-0003-8728-80260000-0002-4143-39160000-0002-3868-7878