The current study aimed at developing EFL speaking skills for prospective teachers of English through a program based on successful intelligence theory. The researcher employed a one group pre-posttest quasi-experimental design. The participants of the current study were fourth year prospective teachers of English. Thirty-four (18male and 16 female) students were chosen randomly from Beni Suef faculty of education to take part in the current study during the second semester of the academic year (2019-2020). The experiment lasted for three months. A speaking skills checklist, a pre-post speaking test, and a rubric for oral presentation were administrated in the current study. The findings showed that there was a statistically significant positive effect of the program on developing speaking subskills (describing pictures and events, apologizing, making suggestions, giving advice, giving oral presentation) and the overall of speaking skill for the participants. Recommendations of the study and suggestions for further research were also provided.