In this study, deinking of old newspaper by chemical and enzymatic methods was investigated. Chemical treatment was conducted using chemicals at different times of 10, 20 and 30 minutes, consistency of 10%, temperature of 50±1oC along with washing, flotation and combination of washing/flotation. While, enzymatic treatment was accomplished at different concentrations of 0.025, 0.05, 0.1 and 0.2% of cellulase enzyme (on the basis of oven dried waste paper), pH range of 5-5.5, different times of 10, 15 and 20 minutes, consistency of 10%, temperature of 50±1oC along with washing. The results of comparing optimal chemical and enzymatic treatments showed that, deinked pulp by chemical method provided higher brightness and yellowness. Also, deinked pulp by chemical method had provided papers with higher bulk, higher caliper as well as higher air resistance.