This data set contains all currently available tweets from the beginning of the Black Lives Matter (BLM) movement in 2013 to September 2020. All tweets contain the following keywords BlackLivesMatter, AllLivesMatter, and BlueLivesMatter, or some variation (e.g., #blacklivesmatter or black lives matter). The data set consists of 56.1 million tweets from 11.7 million users. A full description of the data set and data collection methods are available here. Instructions on pulling the Twitter data from the Twitter API are here. Please use the following citation if you use this data in a paper: Giorgi, S., Guntuku, S. C., Rahman, M., Himelein-Wachowiak, M., Kwarteng, A., & Curtis, B. (2020). Twitter Corpus of the# BlackLivesMatter Movement And Counter Protests: 2013 to 2020. arXiv preprint arXiv:2009.00596.