This study ascertained the relationship between language maturity and mode of aggressive expression. More than 100 second and third grade children from Tallahasee, Florida schools took an apperceptive aggressive test to determine aggressive modality and then completed a portion of the Paradigmatic-Syntagmatic Language List to assess language maturity. This study was designed to test the following hypotheses: (1) there is a significant negative relationship between language maturity and physical mode of aggression when sex and social class are held constant, and (2) there is a significant positive relationship between language maturity and verbal mode of aggression when sex and social class are held constant. Results indicated that physically aggressive children selected the physical mode regardless of sex or social class, refuting previous research in the area of aggressive behavior. The best predictor for physical aggressive expression appeared to be language immaturity. Additionally, the results indicated that verbal aggression may be the result of language maturity although its predictability was not as strong as physical aggression. In the case of verbal aggressive expression, sex was the single best predictor. (DST)