This study deals with the research into the relationship between gender, motivation and achievement in learning English as a foreign language. A good command of English is of paramount importance for an individual to be successful in numerous aspects of life such as professional, personal and educational. The aim of this research was to determine how gender influences motivation and achievement in learning English as a foreign language. The research sample consists of 185 students aged ten (fifth grade), fourteen (ninth grade) and eighteen (twelfth grade). The results demonstrate a statistically significant relationship between gender and motivation. Ten-year-old students exhibit the highest motivation for learning English as a foreign language, while the eighteen-year-olds exhibit the lowest motivation. In addition, female students are more successful at learning English as a foreign language than male students at each group/grade level. Moreover, the findings also reveal statistically significant results in measuring the correlation between achievement and motivation and can be highly beneficial for teachers, parents and students in adopting the most effective approach to learning and teaching English as a foreign language.