The trophic magnification slope (TMS) of mercury has been reported from >130 aquatic systems in the world. However, data from the Asia-Pacific region is quite lacking despite the need for estimation of Hg exposure via fish consumption in many of those regions in the world. Here we provide TMS values from three marine regions in the Pacific rim, Oregon coast, USA, Sanriku coast, Japan, and Jakarta Bay, Indonesia. A decreasing trend of TMS from temperate to tropical regions was found in this study.