Collective teacher efficacy (CTE) refers to the collective perception that teachers in a given school make an educational difference to their students over and above the educational impact of their homes and communities. Significant positive relationships were found between CTE and student achievement on the grade 8 math, writing, and English tests. In addition, significant relationships were found between the both the instruction and discipline subscales of CTE with all three tests of student achievement. When controlling for socioeconomic status, CTE made a significant independent contribution to the grade 8 writing scores; however it did not independently explain math and English achievement. (Contains 3 tables and 1 figure.)