Visualization is a powerful mechanism for extracting information from data. ggplot2 is a contributed visualization package in the R programming language, which creates publication-quality statistical graphics in an efficient, elegant, and systematic manner. This article summarizes key features of the package with examples from pharmacometrics and pointers to available resources for learning ggplot2.CPT: Pharmacometrics & Systems Pharmacology (2013) 2, e79; doi:10.1038/psp.2013.56; advance online publication 16 October 2013.