This study aims to describe the validity of the Constructivist Teaching Sequence (CTS) learning module assisted by Augmented Reality (AR) on the cell concept material. The method used is Research and Development (R&D) with reference to the ADDIE development model which is implemented until the limited trial stage. This study uses a quantitative descriptive method which was implemented during July-December on 25 grade XI students of SMA Negeri 2 Gorontalo. The validation results show that the module obtained a score of 75% from material experts with the category "Valid" and 96% from media experts, with the category "Very Valid". Based on these results, the AR-assisted CTS learning module is declared valid and feasible to be used in biology learning on the cell concept material.
                        
                        
                        
                        
                            
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