Yes, you can use Splunk on Japanese environment with translated GUI + Japanese Encoding for input data. For prerequisites for installation, you may refer to the installation manual, and I don't think there is specific environment requirement for Japanese environment. http://docs.splunk.com/Documentation/Splunk/latest/Installation/Whatsinthismanual Also documentation is available in Japanese. http://docs.splunk.com/Documentation/Splunk/latest/Translated/Japanesemanuals To view Splunk UI in Japanese, change locale portion (e.g. en-US) SplunkWeb URL to ja-JP localhost:8000/ja-JP/app/search/ ... View more