In the last couple of decades, language educators have focused on the development of communicative language teaching approaches, which emphasize teaching language through communication. Among these approaches, Task-Based Language Teaching (TBLT) has gained popularity, and it is believed that TBLT can contribute to the development of speaking ability among learners. This study aims to investigate the effectiveness of TBLT in developing speaking ability among intermediate level Iraqi students. This quasi-experimental study included 50 individuals from a public school in Iraq. Students in the experimental group were taught using TBLT, whereas those in the control group were taught conventionally. The research data were acquired using two instruments of tests (pre- and post-test) to assess the students' speaking performance before and after treatment, as well as a questionnaire to determine their attitudes toward English. The validity and reliability of the study instruments were confirmed. The results of the research were analyzed using ANCOVA and MANCOVA. The data revealed that TBLT greatly enhances students' speaking abilities, and they have positive sentiments concerning its use in their speaking classes.