BACKGROUND Chin augmentation with hyaluronic acid (HA) injections can effectively improve mental appearance. OBJECTIVE To introduce a HA injection technique for chin augmentation and evaluate its clinical effects. METHODS A total of 326 patients who received HA injection for chin augmentation from January 2018 to May 2021 were retrospectively reviewed. All patients were injected with the technique according to the anatomical morphology of the chin using a needle and cannula. Patient data were collected, the effects were analyzed, and adverse reactions were observed and recorded. RESULTS There were 326 patients involved in this study with a mean age of 26.4 years. The median volume of HA injected was 1.85 mL. The shape and contour of the chin was significantly improved in all patients immediately after injection. Most improvements were retained up to 6 months and partial improvements remained visible for 12 months. Swelling and pain occurred in 284 patients (87.1%), local ecchymosis occurred in 31 patients (9.5%), and asymmetry was found in 8 patients (2.5%). There were no other complications such as infection, embolism, necrosis, nodule, or witch's chin. All patients reported satisfaction with results of the HA injections. CONCLUSION Injection of HA according to the anatomical morphology of the chin is a safe and effective technique for chin augmentation and results in high patient satisfaction.