The debate about the concept of efficient markets are still common among experts until now. However emerged a number of new studies which suggested market anomaly which is a deviation from the concept of efficient markets. One kind of market anomalies is most often observed seasonal anomalies in this study consisted of the day of the week effect, week four effect, and the January effect. This research aims to determine whether there are significant market anomalies on stock return. The unit of analysis in this study is the daily stock return data LQ-45 from the date of July 1st, 2013 to June 30th, 2014. The sample in this research is secondary data and selected by using purposive sampling method. The sample of this research consist of 37 companies listed in index LQ-45 consistently in the period July 1st, 2013 to June 30th, 2014. The analysis method of this research used regression analysis with dummy variable.The result of this research showed that the day of the week effect didn’t have negative significant effect to stock return, week four effect didn’t have negative significant effect to stocks return, and Jauary effect didn’t have positive significant effect to stock return