Adsorption characteristics of two types of polyvinyl alcohols (with different polymerization degrees) on faujasite-type zeolites obtained by SiCl4 treatment as well as by a combined hydrothermal acid treatment were investigated in an aqueous solution. No adsorption of the polyvinyl alcohol with a polymerization degree of 500 was observed on the SiCl4-treated faujasite without secondary pores in the mesopore region, but adsorption did occur (about 0.11 g g(-1)) on the hydrothermal acid-treated faujasite containing secondary pores. On the other hand, the polyvinyl alcohol with a polymerization degree of 2,000 did adsorb on the SiCl4-treated faujasite. Scanning electron microscopy measurements confirmed that adsorption occurred on the external surface of the zeolite crystals.