The purpose of this study was to compare the effects of keeping a gratitude journal (GJ) and a forgiveness journal (FJ) on trait anger and anger expression (anger-control, anger-out, and anger-in) among 76 elementary students. Three 4th grade classes were assigned to either GJ, FJ, or no-treatment condition. Students in the two experimental condition engaged in keeping a GJ or a FJ for 20 minutes daily over two months under the guidance and supervision of their homeroom teachers. Results indicated that students in the GJ group demonstrated a significantly decreased anger-out score, compared to their pre-intervention level, and participants in the FJ group exhibited also significantly lowered anger-in scores. However, no significant changes in terms of anger-control. were found in all three groups. Our findings support that keeping a GJ or a FJ, which has been a very common psychoeducational programs in elementary schools, can lead to a significant reduction of dysfunctional anger expression among elementary students once implemented persistently on a regular basis. Our results further implicate that primarily anger-out and anger-in students may particularly benefit from keeping a GJ and a FJ, respectively. Along with some limitations of current study, suggestions for future studies were fully discussed.