Development of Thematic Teaching Materials Based on Local Wisdom Values to Improve Fourth Grade Student Learning Outcomes in Elementary Schools Ester 1 , Surya Dharma 2 , Dede Ruslan 3 { Ester.nainggolan27@gmail.com } The Basic Education Study Program of Postgraduate School of Universitas Negeri Medan 1 , Lecturer at Universitas Negeri Medan 23 Abstract. This study aims to describe the level of feasibility and effectiveness of developing thematic teaching materials based on local wisdom values to improve the learning outcomes of fourth grade students. This research was carried out in an elementary school in Palipi District, Samosir Regency. The subjects of this study were fourth grade students, totaling 30 students. This research method is development research from Borg and Gall. The results of the study show (1) the learning design developed is included in the very good criteria and is suitable for use; (2) the development of thematic teaching materials based on practical local wisdom values used to improve student learning outcomes; and (3) effective teaching materials are used to improve student learning outcomes. The results of the effectiveness of teaching materials of 92% are in the very good category. Keywords: Thematic teaching materials, local wisdom, learning outcomes 1. Introduction This study is a development study. There are several types of models for development methods. The development model used is approach. One of the programs aimed at achieving the country's educational goals is the organization and implementation of what is commonly known as Basic Education Units or Elementary Schools. Education is always evolving. One of them is to continuously improve the curriculum to improve the quality of education. Furthermore, the ever-evolving technological developments indirectly influence the development of current educational curricula [1], [2]. However, changes or curriculum developments implemented by the government are still of a general nature. So far, there is no curriculum in which the learning materials correspond to the student's environment, culture and local customs. Using materials that are appropriate to the student's situation, culture, and local customs is intended to make it easier for students to understand the material, and allows students to sort the material from the simplest and simplest to the most general. It is intended to make students interested in understanding even the most complex and complicated things [3 ]. Interest in learning, or what is called interest in learning, is one of the most important factors for a student's learning success. In reality, we have to admit that there AISTEEL 2022, September 20, Medan, Indonesia Copyright © 2022 EAI DOI 10.4108/eai.20-9-2022.2324695