Research investigating the relationship between classroom environment and self-handicapping was conducted in Australian and Canadian high schools. A sample of 2,006 students responded to a questionnaire that assessed student perceptions of classroom environment and self-handicapping. Simple and multiple correlational analyses showed that classroom environment accounted for small but significant proportions of variance in self-handicapping. Enhanced affective dimensions of the classroom environment were associated with reduced levels of self-handicapping. For Australian and Canadian students, the relationship between each classroom environment scale and self-handicapping was very similar. There were no significant gender differences in the relationship between each classroom environment scale and self-handicapping. A commonality analysis revealed that conventional rather than constructivist classroom environment dimensions accounted for most of the variance in self-handicapping. (Contains 4 tables.)