This descriptive research study aimed to explore how the Teaching Learning Process (TLP) affects students' academic performance at the secondary school level in Peshawar. The research included all secondary school teachers in District Peshawar Khyber Pakhtunkhwa Province of Pakistan. Using the multi-stage random sampling procedure, a sample of 240 Secondary School teachers was selected for data collection as per Krejcie & Morgan's (1970) standardized table. The questionnaire's reliability was found to be within an acceptable to good range. The analysis was conducted using SPSS, utilizing various statistical methods, i.e., a one-sample t-test, Pearson Correlation, and simple regression, to test the hypothesis. The BISE Peshawar annual examination 2022 results were used to determine the student's achievement scores. The data analysis showed that most of the teachers agreed with this. It was revealed that the teaching-learning process and Students' achievement showed a significant positive linear association. Similarly, the regression analysis also showed that there was a positive and statistically significant relationship between the teaching-learning process and students' achievement. Certain recommendations were provided based on the findings. Therefore, the research supports the notion that the Teaching Learning Process (TLP) plays a crucial role in enhancing student academic performance. It is also recommended that further studies investigate the impact of the Teaching Learning Process (TLP) across different educational levels.