This research aims to determine the relationship between social care character and interpersonal communication, environmental care character and interpersonal communication, and the combined relationship of both social and environmental care characters with interpersonal communication among students. A quantitative correlational approach was employed, involving 144 Grade V students from public elementary schools in Girimulyo District. Cluster random sampling was used based on population requirements. Data were collected through questionnaires assessing social care character, environmental care character, and interpersonal communication. Instrument validity was tested on 56 individuals, with a power analysis conducted to refine the questions. Reliability was measured using Cronbach's Alpha. Data analysis included descriptive statistics, normality and linearity tests, and hypothesis testing through simple and multiple correlation analyses. The results revealed that: 1) social care character is moderately related to interpersonal communication (correlation coefficient = 0.364); 2) environmental care character has a weaker yet positive relationship with interpersonal communication (correlation coefficient = 0.265); and 3) both social and environmental care characters are moderately related to interpersonal communication (R = 0.429). These findings suggest the importance of fostering social and environmental care character to enhance students' interpersonal communication skills.