WinBUGS is statistical software for Bayesian analysis using Markov chain Monte Carlo (MCMC) methods.

It is based on the BUGS (Bayesian inference Using Gibbs Sampling) project started in 1989.

[1] It was developed by the BUGS Project, a team of British researchers at the MRC Biostatistics Unit, Cambridge, and Imperial College School of Medicine, London.

Originally intended to solve problems encountered in medical statistics, it soon became widely used in other disciplines, such as ecology, sociology, and geology.

WinBUGS 1.4.3 remains available as a stable version for routine use, but is no longer being developed.