Globally, mercury management at the national level in Korea (Republic of) has been required by ratifying to the Minamata Convention. In particular, it is necessary to identify the sources of mercury waste. Red stamping inks in Asian countries such as China, Japan and Korea have been used to prove identification. However, there is a lack of information on mercury content and hazardous characteristics of mercury in red stamping ink. To evaluate hazardous characteristics of mercury in red stamping ink, leaching tests such as Korea Extraction Test (KET) and Toxicity Characteristic Leaching Procedure (TCLP) were carried out as well as mercury content analysis. The mercury content in red stamp ink was estimated to be 0.664 mg/kg. The leaching concentrations of mercury were detected to be 0.4 μg/L or less in KET and 2.1 μg/L or less in TCLP. From these results, it was found that the leaching concentration of mercury in red stamping ink was satisfied with the regulatory level prescribed by KET and TCLP. Hence, the red stamping inks in Korea were generally verified to be non-hazardous wastes.