This paper investigates whether internal or external factors explain in°ation in Egypt over the period 2003M1-2012M12. Using an autoregressive distributed lag model, results indicate that money supply and global commodity prices a®ect in°ation in the long-run, while important short-run factors are in°ation persistence, exchange rate depreciation and supply side bottlenecks. It is also shown that global commodity prices, especially energy prices, pass-through into headline in°ation in Egypt with a short lag. These results take into account the di®erent stationary characteristics of di®erent time series variables and are robust to di®erent model speci¯cations. Policy recommendations include the necessity of reforming the government's energy subsidy bill, less monetization of the de¯cit and gradual liberalization of the currency in order to curb in°ationary pressures in Egypt and put the economy on a more sustainable path.