Responding to the paucity of research regarding the role of altruism in L2 education, we operationalized the phenomenon in the L2 context and sought to determine whether teachers' concern about the growth and welfare of the students has any influence on their language learning. In doing so, the effectiveness of a three-staged altruistic teaching intervention was tested on foreign language enjoyment (FLE) and speaking skills of 50 EFL learners, where 25 learners were assigned to the experimental group, and the remaining 25 were involved in the control group and attended the program for ten consecutive weeks. This quantitative study relied on the data obtained from the scores of the groups on the FLE scale and IELTS Speaking Test before and after the intervention. The data was analyzed using Repeated Measures ANOVA, One-Way ANCOVA, and Simple Effect analysis. Results illustrated that altruistic teaching makes language learning more enjoyable. Moreover, the results showed that altruistic teaching not only hones the learners' speaking proficiency but is also beneficial for its retention. Several theoretical and pedagogical implications and directions for future research on positive psychologically-informed interventions are also discussed.