The purpose of this study was to describe the need for online learning using theplatform Gather Town to improve student mathematics learning outcomes. The type of research used is descriptive qualitative. The population in this study was class VIII SMP Negeri 3 Cisauk, while the sample was taken by purposive sampling technique, namely class VIII.4 and VIII.5 as many as 88 students. Data collection techniques in this study used interview techniques, questionnaires, and the results of the Semester Results Assessment (PAS). First, all students' mathematics learning outcomes are still above the KKM, but 43% of students fall into the category of low student learning outcomes. Second, the learning media used did not stimulate students to play an active role in learning mathematics. Third, 83% of students are interested in online learning using the gather town platform. This study concluded that online learning media using the gather town platform needs to be applied to improve students' mathematics learning outcomes.