Simon Gilchrist, Vivian Yue, and Egon Zakrajsek | This paper uses high-frequency data to analyze the effects of US monetary policy–during the conventional and unconventional policy regimes–on foreign government bonds markets in advanced and emerging market economies. The results indicate that an expansionary US monetary policy steepens the foreign yield curve–denominated in local currency–during a conventional US monetary policy regime and flattens the foreign yield curve during an unconventional policy regime. The passthrough of unconventional US monetary policy to foreign bond yields is, on balance, comparable to that of conventional policy. In addition a conventional US monetary easing leads to a significant narrowing of the credit spreads on dollar-denominated sovereign bonds that are issued by countries with a speculative-grade sovereign credit rating. However, during the unconventional policy regime, yields on speculative-grade sovereign debt denominated in dollars move one-to-one with yields on comparable-m aturity US Treasury securities.