This study aims to determine mental health in the form of stress levels and psychological well-being in former drug addicts at the Mitra Alam Foundation, Surakarta. The research population is former drug addicts who have been rehabilitated and declared cured at the Mitra Alam Foundation as many as 100 with a sample of 50 people. This study uses a quantitative research method using the psychological well-being scale and the DASS 21 stress level. Based on the results of the study, it can be concluded that the level of psychological well-being of former drug addicts at Mitra Alam Foundation is high, namely 70%, very high 18% and moderate 12%. While the mental health of former drug addicts at Mitra Alam Foundation as a whole showed symptoms of mild mental disorders by 56%, moderate 34% and normal 10% which were described as follows: normal stress levels (82%), mild stress (18%), anxiety (anxiety) normal 24%, mild anxiety (50%) and moderate anxiety (26%), normal depression category (88%), mild depression (10%), and moderate depression (2%). The correlation between stress levels and psychological well-being of former drug addicts at Mitra Alam Foundation was analyzed using linear regression and showed a correlation result of 0.157 with a coefficient of determination (r square) 0.025 which means that the influence of the independent variable, namely the level of stress on the psychological well-being of ex-addicts Drugs in Mitra Alam Foundation is 2.5% and others are influenced by other factors. Penelitian ini bertujuan untuk mengetahui kesehatan mental berupa tingkat stress dan kesejahteraan psikologis pada mantan pecandu NAPZA di Yayasan Mitra Alam Surakarta. Populasi penelitian merupakan mantan pecandu NAPZA yang pernah direhabilitasi dan dinyatakan sembuh di Yayasan Mitra Alam yaitu sebanyak 100 dengan sampel yang diambil yaitu sebanyak 50 orang. Penelitian ini menggunakan metode penelitian kuantitatif dengan menggunakan skala kesejahteraan psikologis dan tingkat stress DASS 21. Berdasarkan hasil penelitian dapat disimpulkan bahwa tingkat kesejahteraan psikologis para mantan pecandu NAPZA di Yayasan Mitra Alam tergolong tinggi yaitu 70%, sangat tinggi 18% dan sedang 12%. Sedangkan Kesehatan mental para mantan pecandu NAPZA di Yayasan Mitra Alam secara keseluruhan menunjukkan gejala gangguan mental ringan sebesar 56%, sedang 34% dan normal 10% yang dijabarkan sebagai berikut: tingkat stress normal (82%), stress ringan (18%), kecemasan (anxiety) normal 24%, kecemasan ringan (50%) dan kecemasan sedang (26%), kategori depresi normal (88%), depresi ringan (10%), dan depresi sedang (2%). Korelasi antara tingkat stres dan kesejahteraan psikologis para mantan pecandu NAPZA di Yayasan Mitra Alam dianalisis dengan menggunakan regresi linier dan menunjukkan hasil korelasi sebesar 0,157 dengan koefisien determinasi (r square) 0,025 yang mengandung arti bahwa pengaruh variabel bebas yaitu Tingkat Stres terhadap Kesejahteraan Psikologis para mantan pecandu NAPZA di Yayasan Mitra Alam adalah sebesar 2,5% dan lainnya dipengaruhi oleh faktor lainnya yang tidak diteliti dalam penelitian ini