To verify business cycle forecasting models, they should be checked against historical data on business cycles. There is an official reference to business cycle dating in many countries. In Iran, though, there is no official or de facto reference for this, and so most of research papers propose datings for business cycles in Iran and verify their models with those datings, and the problem is that those datings are not consistent with each other. In this paper we first review the methods used for dating business cycles. Then using a wide range of data on Iran’s economy, we propose a dating for Iranian business cycles for years 1988 to 2008.