The study investigates the relationship between liquidity and returns on a stock exchange in a frontier market. The paper applies three asset pricingmodels, including Capital Asset Pricing Model (CAPM), the Fama-French three-factor model, liquidity-augmented three-factor model. To measure theliquidity in the study, five measures: quoted spread, trading volume, trad ing value, Amihud measure, and turnover ratio were applied. The empiricalresearch is carried out in 179 non-financial companies on the Ho Chi Minh Stock Exchange in Vietnam from 2011 to 2019. The study documents thatliquidity is an essential source of effect on stock returns on the Ho Chi Minh stock exchange. Using the GRS-test, the models were compared and assessed. The result shows that the liquidity-augmented three-factor model with liquidity factor is the most significant model to capture the impact ofliquidity on stock returns on the Ho Chi Minh Stock Exchange