Persaingan yang ketat dalam dunia bisnis saat ini mendorong perusahaan untuk meningkatkan kinerja karyawan demi mencapai tujuan organisasi. Substantive Corporate Social Responsibility (CSR) Attributions menjadi salah satu pendekatan penting dalam meningkatkan Work Engagement karyawan. Oleh karena itu, penelitian ini bertujuan untuk menganalisis pengaruh Substantive CSR Attributions terhadap Work Engagement melalui tiga model mediasi: Work Meaningfulness, Psychological Safety, dan Organization-Based Self-Esteem. Penelitian ini dilakukan di PT XYZ Telekomunikasi Kantor Pusat Jakarta Selatan. Data dikumpulkan melalui survei yang melibatkan 150 karyawan divisi operasional dengan menyebarkan kuesioner secara online melalui Google Forms. Penelitian ini merupakan penelitian kuantitatif, dengan metode pengumpulan data non-probability sampling menggunakan teknik convenience sampling dan menggunakan skala Likert 5 poin. Metode analisis mencakup statistik deskriptif, pengukuran dan pemodelan struktural menggunakan software SmartPLS 4.0. Hasil penelitian menunjukkan bahwa Substantive CSR Attributions berpengaruh positif terhadap Work Engagement, baik secara langsung maupun melalui tiga model mediasi: Work Meaningfulness, Psychological Safety, dan Organization-Based Self-Esteem. Namun, temuan juga menunjukkan bahwa Work Meaningfulness dan Organization-Based Self-Esteem tidak memediasi hubungan antara Substantive CSR Attributions dan Work Engagement. Temuan ini menekankan pentingnya implementasi Substantive CSR Attributions yang tulus dan berorientasi pada karyawan, serta perlunya kebijakan manajerial yang mendukung terciptanya Psychological Safety untuk mendorong Work Engagement secara optimal / The growing competition in today’s business landscape requires companies to consistently improve employee performance to achieve organizational goals. Substantive Corporate Social Responsibility (CSR) attributions have become an essential approach to strengthening employee engagement. However, the effectiveness of such initiatives often depends on how employees perceive meaning in their work, feel psychologically safe, and develop self-esteem rooted in their organizational identity. Therefore, this study aims to analyze the mediating role of work meaningfulness, psychological safety, and organization-based self-esteem in the relationship between substantive CSR attributions and work engagement. This research was conducted at the head office of PT XYZ Telekomunikasi, South Jakarta, involving 150 employees from the operations division. Data were collected through an online questionnaire distributed via Google Forms. This is a quantitative study using non-probability sampling with a convenience sampling technique and employing a five-point Likert scale. Data analysis was conducted using descriptive statistics, measurement modeling, and structural equation modeling through SmartPLS 4.0 software. The results indicate that substantive CSR attributions positively influence work engagement both directly and indirectly through the mediating variables. However, only psychological safety was found to significantly mediate this relationship, while work meaningfulness and organization-based self-esteem did not show a significant mediating effect. These findings underline the importance of implementing employee-centered and genuine CSR initiatives, as well as establishing managerial policies that foster psychological safety to effectively boost employee engagement.