The objective of this research is to find out: increase in interest and learning achievement in learning Indonesian by applying the group learning model of Class V students at SD Negeri 37 Ampenan for the 2018/2019 academic year. This research is a classroom action research. The subjects in this study were 29 students of grade V SD Negeri 37 Ampenan with 11 male students and 18 female students. The data collection techniques used were observation, documentation, and tests. The increase in students' cognitive learning outcomes before and after the implementation of Group Learning at SD Negeri 37 Ampenan can be seen from the percentage acquisition of each indicator, namely: That Indonesian learning outcomes have increased in each cycle. This is evidenced by the acquisition of data on Indonesian learning outcomes in the initial data, cycle I, and cycle II. In the initial data, the average Indonesian learning outcomes of students also increased, in the initial data the average learning outcomes obtained by students were 75.79 with completeness 68.97, experiencing an increase in the first cycle with an average acquisition of 78.52 with completeness 82.76. And there was an increase in cycle II with an average gain of 78.52 with 100 completeness. Learning planning carried out by the teacher was an increase from 75.00% in cycle I and 85.00% in cycle II. So the lesson planning carried out by the teacher is very good. While the implementation of learning by the teacher also experienced an increase from 79.17% in cycle I and to 87.50% in cycle II. So the implementation of learning carried out by the teacher has also increased. Student learning activities that the average percentage in the first cycle was 80.00%. But in cycle II, student learning activities have increased to 90.00%. So student learning activities in Indonesian language learning are good.