The GESIS Fall Seminar in Computational Social Science 2021 will take place online from 13 September to 01 October 2021. Six one-week courses on computational social science methods and techniques using either R or Python will be offered in two parallel strands. The Fall Seminar is aimed at social scientists, data scientists and researchers in the digital humanities who want to collect and analyse data from the web, social media or digital text archives. The lectures in each course are complemented by practical exercises that give participants the opportunity to apply these methods to data. All courses are held in English.