The NCASD Lab is pleased to announce the first public release of the “relevent” package for the R statistical computing system. The relevent package provides tools to fit relational event models (as introduced in Butts (2008)), and includes support for dyadic relational events (such as communication or other pairwise interactions), general individual or multi-party interactions, support constraints, exogenous events, and events from multiple sources. The package is freely available under the GNU Public License, and can be obtained from within R using install.packages(“relevent”) or by direct download from CRAN. Relational event models can be used to study a wide range of social phenomena, with current applications ranging from radio communications and improvisation among emergency responders to interactions among high school students. The relevent package makes it possible for researchers to more easily take advantage of this versatile approach to modeling social behavior.