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Background and purpose: The impact of subthalamic nucleus deep brain stimulation (STN‐DBS) on caregivers' burden is understudied. We perform a systematic review and meta‐synthesis aggregating qualitative studies involving partners of people with Parkinson disease (PwP) to explore their experiences and unmet needs. Methods: A systematic review for retrieving qualitative studies included six databases: MEDLINE, Embase, CINAHL, Cochrane, PsycInfo, and Scopus. Inclusion criteria were as follows: (i) studies on the experience of caregivers of PwP in the context of STN‐DBS, (ii) English peer‐reviewed articles, and (iii) qualitative or mixed methods studies reporting caregivers' quotations. After the appraisal of included studies, we performed meta‐synthesis of qualitative findings. Descriptive themes and conceptual elements related to PwP partners' experiences and unmet needs were generated. Results: A total of 1108 articles were screened, and nine articles were included. Three categories were identified: (i) dealing with Parkinson disease (PD) every day (the starting situation characterized by the impact of PD on ordinary life; the limitations to partners' socialization; partners' efforts in stepping aside for love and care activities), (ii) facing life changes with STN‐DBS (the feeling of being unprepared for changes; the fear and concern due to loved ones' behavioral changes; struggling to find an explanation for those changes), and (iii) rebuilding the role of caregiver and partner after STN‐DBS. Conclusions: This meta‐synthesis elucidates concerns, challenges, and unmet needs of partners of PwP who underwent STN‐DBS. It is important to provide them with information, education, and adequate support to face these challenges. Professionals need to involve partners in the care and decision process, because STN‐DBS‐related outcomes do not depend solely on the well‐being of PwP but also on the well‐being of individuals surrounding them. [ABSTRACT FROM AUTHOR]