Academic honesty is a fundamental property of character values from an early age. It should be integrated into every learning process in the context of habituation towards continual learning. This study aimed to investigate student's academic honesty through acid-base material in chemistry using contextual-based discovery learning (CDL) model. By employing quasi-experimental design, it involves 238 participants at four high schools, which were divided into experimental group and control group. Academic honesty assessment is carried out during learning and tests. Observation and interviews used to collect data on student's academic honesty. The results reveal that implementing CDL in acid-base material of chemistry subject affects student's academic honesty. The result of academic honesty test and observation showed that the academic honesty of students that though by CDL was higher than learning without CDL. A specific material of acid-base in chemistry becomes media that confronts students directly with real situations combined with proper prior knowledge that can lead to the character value of honesty as integrated with Indonesian Character-based Curriculum.