en Clinical Psychology پژوهشي Research Article <span style="font-size:12pt"><span style="line-height:200%"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><b><span style="line-height:200%">Objectives</span></b><span style="line-height:200%">: The present study aimed to compare the effectiveness of acceptance and commitment therapy and hope therapy based on a positive psychology approach in psychological well-being and improvement of mental health among medical staff during the Covid1-19 pandemic.</span></span></span></span></span><br> <span style="font-size:12pt"><span style="line-height:200%"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><b><span style="line-height:200%">Methods</span></b><span style="line-height:200%">: This quasi-experimental study was conducted based on a pre-test post-test control group design. In this research, the statistical population included all the medical staff (nurses and doctors) of Valiasr (A.S.) and Samen Ala&#39;mh hospitals during the Covid-19 pandemic, and 90 subjects were selected from each hospital via </span><span lang="EN" style="line-height:200%">available sampling</span><span style="line-height:200%">. They were assigned randomly to four groups, two experimental groups and two control groups (n=30 in each group). The first experimental group (ACT) received 8 sessions (one session per week for 120 min), and the second experimental group received 10 sessions of hope therapy based on positive psychology based on Seligman&#39;s treatment protocol, 2011) (one session every week for 90 min). &nbsp;The tools used in this research were psychological well-being and general health questionnaires. The information obtained in the pre-test and post-test phases were analyzed in SPSS software (version 25) using covariance analysis</span></span></span></span></span><br> <span style="font-size:12pt"><span style="line-height:200%"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><b><span style="line-height:200%">Results</span></b><span style="line-height:200%">: </span><span lang="EN" style="line-height:200%">The results pointed out that the therapy of acceptance and commitment and hope therapy based on a positive psychology approach was effective in psychological well-being and improvement of mental health of the medical staff in Valiasr (a.s.) and Saman Al-Aimeh (a.s.) hospitals during the Covid-19 pandemic </span><span style="line-height:200%">(P<0.01).</span></span></span></span></span><br> <span style="font-size:12pt"><span style="line-height:200%"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><b><span style="line-height:200%">Conclusion</span></b><span style="line-height:200%">: As evidenced by the results of this study, the mental health and psychological well-being of the medical staff can be improved by new psychological solutions. These treatments are effective to a large extent in improving employees&#39; individual and social performance</span><span dir="RTL" lang="FA" style="line-height:200%"><span style="font-family:Mitra">.</span></span><span style="line-height:200%"></span></span></span></span></span><br> <br> &nbsp; Acceptance and commitment, Covid-19, Mental health, Psychological well-being, Therapeutic hope 41 49 http://ajnpp.umsha.ac.ir/browse.php?a_code=A-10-142-7&slc_lang=en&sid=1 Mohammad Tahan Tahan@ut.ac.ir 10031947532846006521 10031947532846006521 Yes Department of Psychology and Education of Exceptional Children, University of Tehran, Tehran, Iran Hashem Sabriyan rachel.chew1971@gmail.com 10031947532846006522 10031947532846006522 No Research Center for Cognitive & Behavioral Sciences in Police, Directorate of Health, Rescue & Treatment, Police Headquarter, Tehran, Iran