Low-molecular-weight (LMW) organic acids exist widely in soils and have been implicated in many soil processes. The objective of the present paper was to evaluate effect of two LMW organic acids, citric acid and oxalic acid, on Cl-adsorption by three variable charge soils, a latosol, a lateritic red soil and a red soil, using a batch method. The results showed that the presence of citric acid and oxalic acid led to a decrease in Cl- adsorption with larger decreases for citric acid. Among the different soils Cl- adsorption in the lateritic red soil and the red soil was more affected by both the LMW organic acids than that in the latosol. Low-molecular-weight (LMW) organic acids exist widely in soils and have been implicated in many soil processes. The objective of the present paper was to evaluate the effect of two LMW organic acids, citric acid and oxalic acid, on Cl-adsorption by three variable charge soils, a latosol, a lateritic red soil and a red soil, using a batch method. The results showed that the presence of citric acid and oxalic acid led to a decrease in Cl- adsorption with larger decreases for citric acid. Among the different soils Cl-adsorption in the lateritic red soil and the red soil was more affected by both the LMW organic acids than that in the latosol.