This research was motivated by a problem identified in class V of SDN Brawijaya, Sukabumi City, namely the low critical thinking skills of students in this learning process. This research aims to improve students' critical thinking skills and describe students' responses to the differentiation learning approach. The subjects of this research were 30 class V students at SDN Brawijaya, Sukabumi City in the even semester of the 2023/2024 academic year. This research was carried out in 2 cycles and the material taught was Harmony in Ecosystems. Data on students' critical thinking skills is collected using critical thinking skills tests. This research is said to be successful if the average classical critical thinking skills of students are at least in the good category and classical completeness is at least 80%. Student responses were collected using a response questionnaire. The success criteria for student responses is that they are at least in the positive category. Based on the results of the descriptive analysis, it shows that, firstly, there was an increase in students' critical thinking skills which can be seen from the average score of cycle I of 77.20 (fair category) and the average score of cycle II of 85 (good category). Second, students' responses to the implementation of the differentiated learning approach were classified as good with a score of 80% of students stating they were positive.
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