Student perception of class size remains a consideration in the online setting. This study explored graduate student perceptions of class size and impact on instructor effectiveness and student engagement. Data was gathered via a web-based survey with a sample of online graduate students. Respondents noted 20 or 25 students as the point that instructor effectiveness was impacted in a negative manner. Respondents indicated 20 or more students had a negative impact on student engagement, including connections with other students. Class size is important for administrators to consider when determining online graduate class size limits to support a positive learning experience.