The aim of this study is, examining the experiences of the pre-service mathematics teachers (PMTs) on the use of Thinglink in out-of-school learning environments in mathematics teaching. Within this study, a descriptive case study methodology was employed. This study was conducted during the 2022-2023 academic year and involved a total of 60 pre-service mathematics teachers, consisting of 49 females and 11 males. The participants were PMTs who were in their sixth semester and were enrolled in the 'Out of School Learning Environments' course at a university. Within the scope of the study, the 11-week part of the 'Out of School Learning Environments' course was conducted theoretically, and the 3-week part included presentations containing Out-of-School Learning Activities Designed Using Thinglink prepared by PMTs. The data utilized in this study emanates from two primary sources: Out-of-School Learning Activities Designed Using Thinglink [OSLADTs] and course materials, including lesson plans, worksheets, and brochures, all of which were developed by PMTs. Content analysis was employed to assess the alignment of the OSLADTs and course materials (lesson plans and worksheets), created by PMTs, with the criteria established by Bunting (2006) for defining out-of-school learning activities. In conclusion, this study underscores the positive impact of OSLADTs on mathematics education when effectively integrated into the curriculum by PMTs. The findings suggest that OSLADTs hold significant potential for enhancing students' engagement, understanding, and appreciation of mathematical concepts.