Previous studies have indicated that, although some teachers have substantial expectation effects on student outcomes, the effects for most teachers are only small. Furthermore, teacher expectations are associated with key pedagogical differences related to teacher beliefs about providing instruction and support for learning. The aim of this study was to explore (a) teacher-level differences in the level and differentiation of expectations, (b) associations between teacher differences in expectations and teacher background and beliefs, and (c) relationships with subsequent student performance. Secondary analyses were performed on data for 42 teachers and their students in New Zealand. The results were supportive of the notion that some teachers were differentiating more between students in their expectations than others. Teachers who differentiated more perceived students generally as more competent, but felt less related to the school team, and perceived more classroom stress. Differentiation in expectations was negatively related to end-of-year mathematics scores.