SeisGo is a package containing a collection of Python functions and scripts for seismic data analysis. It is designed to be user-friendly with easy-to-use functions. It currently has the functionalities to download seismic data (by earthquakes or continuous windows), apply tilt and compliance corrections to OBS data, compute ambient noise cross-correlations, measure velocity changes, stack time series data, and conduct clustering of seismic velocity models. These key functionalities are organized by modules.