Oracle Data Modeler and Oracle SQL Developer does not allow to change the user interface language in “Options” or somewhere else in the GUI. This applies to the versions: Oracle SQL Developer Data Modeler - Version All and later (18.2.0 in my case) Oracle SQL Developer - Version 3.2 and later However, it’s possible switch to other language, changing datamodeler\ide\bin\ide.conf configuration file. The following lines should be added to the file for support English: AddVMOption -Duser.language=en AddVMOption -Duser.country=US Restart application! SQL Developer and Data Modeler supports the following languages: French(fr), German(de), Italian(it), Spanish(es), Brazilian Portuguese(pt BR), Japanese(ja), Korean(ko), Simplified Chinese(zh CN), Traditional Chinese(zh TW).