Remedial learning is a learning activity needed by students to help achieve the expected mastery. Remedial learning can be carried out independently by students through interactive learning resources, these learning resources are modules. The use of electronic modules (e-Module) is very suitable to be applied in the current era of technology, so it is necessary to develop e-Module for remedial learning. This research aims to develop mathematics e-Module for remedial learning that meet valid criteria. The research method used is Research and Development with reference to the ADDIE development model, that's Analyze, Design, Development, Implementation, and Evaluation. However, this study is limited only to the development stage to obtain the validity quality of the e-Module. This validity test is a theoretical validity involving experts in the fields of material and media. The results of this study obtained a mathematics e-module for remedial learning that meets the valid criteria. It was obtained on the basis of comments from the experts on aspects of content, construction, language, appearance, and technical adequacy. The implication of this research is that the mathematics e-module for remedial learning is suitable for testing on students and can be implemented in remedial mathematics learning.