Learning outcomes are one indicator of success in the learning process. Preliminary observations in Grade IV at SDN 13 Kinali revealed that students lacked focus during lessons, teaching was still dominated by lecturing with limited use of learning media, and science (IPA) learning outcomes were not yet optimal. This study aimed to determine the effect of the Teams Games Tournament (TGT) cooperative learning model assisted by Wordwall media on the science learning outcomes of fourth-grade students at SDN 13 Kinali. A quantitative method with a quasi-experimental design, specifically the Nonequivalent Posttest-Only Control Group Design, was employed. The population and sample consisted of all 41 fourth-grade students, selected through a saturated sampling technique. Class IVA served as the experimental group taught using the TGT model assisted by Wordwall, while Class IVB served as the control group taught conventionally. Data were collected through a 20-item multiple-choice achievement test that had previously been tested for validity, reliability, discrimination index, and difficulty level. Descriptive analysis showed a mean score of 78.81 for the experimental class, higher than the control class mean of 70.25. Hypothesis testing using the t-test yielded a significance value of 0.003 (< 0.05); thus H0 was rejected and H1 accepted. These findings indicate that the TGT cooperative learning model assisted by Wordwall media has a significant effect on the science learning outcomes of fourth-grade students at SDN 13 Kinali, West Pasaman. Keywords: Teams Games Tournament (TGT), Wordwall, science learning outcomes, cooperative learning.