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The big-fish–little-pond effect (BFLPE) postulates that class-average achievement has a negative effect on students' academic self-concept. We hypothesized that teachers' use of differentiated instruction strategies would attenuate the BFLPE on French self-concept (FSC). We also explored whether this moderation effect depended on children's individual achievement (i.e., a three-way interaction among class-average achievement, individual achievement, and differentiated instruction). Using hierarchical linear modeling, we tested this moderation effect in a sample of 422 elementary students nested in 27 classrooms. The results showed that the three-way interaction was significant. Simple slopes indicated a significant BFLPE only for students with low individual achievement and for whom teachers reported less frequent use of differentiated instruction strategies. Our findings provide insights into which students …