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This study aimed at enhancing second year official language preparatory school pupils' EFL receptive and productive vocabulary learning through using the integration between incidental and intentional learning. The participants of the study were (60) second year preparatory stage pupils from Ahmed Zweil Official Language School - Benha - Alqalubia. They were assigned into two groups; the experimental group (N=30) and the control group (N=30). The instruments used included a topic selection questionnaire, EFL vocabulary tests (two equivalent forms: one for pre-test and the other one for post-test). A program based on integrating incidental and intentional learning was prepared to show how to apply the integration between incidental and intentional learning. The instruments were administrated before and after the experiment. T-test was used to compare the mean scores of the control group and experimental one in the pre-post applications. Findings of the study revealed that the experimental group pupils' EFL vocabulary receptive and productive learning were higher than those of the control group pupils. Consequently, the integration between incidental and intentional learning was effective in enhancing EFL receptive and productive vocabulary learning.