The present study aimed at developing some EFL vocabulary skills among secondary school students using Electronic Task-Based Learning (ETBL). The participants of the study consisted of first year secondary school students enrolled in Subk El-Dahhak Secondary School, in Menoufia Governorate (N=25). This study adopted one study group pre-posttest design. Five main tools were used: An EFL Vocabulary Skills checklist required for first year secondary school students, an EFL Pre- test to measure some of the students' vocabulary skills, an EFL Post-test to measure some of the students' vocabulary skills, an EFL vocabulary skills rubric to score students' performance on the EFL vocabulary skills tests and a Teacher's Guide. A quantitative data analysis was conducted. The mean scores of the pre-posttests of the participants of the study were compared by using t-test. ETBL was applied to the participants during the first semester of the academic year 2019/2020. Results of the quantitative analysis showed that the participants' some EFL vocabulary skills were developed significantly as a result of ETBL. Therefore, it can be concluded that ETBL was effective in developing some EFL vocabulary skills among first year secondary school students.