What is the name of StarCraft II's official map and campaign editor?

StarCraft II's official map and campaign editor is called the Galaxy Editor.

The Galaxy Editor lets users create and modify maps, terrain, triggers, units, abilities, interfaces, and campaign-style scenarios. It is named after Galaxy, the scripting language used for advanced StarCraft II map logic. Together, these tools support experiences that go beyond standard competitive matches.

The editor helped StarCraft II develop a broad custom-content ecosystem. Users could build tower-defense maps, role-playing scenarios, arcade games, and experimental multiplayer modes. Many projects relied on triggers and data editing rather than ordinary melee-map rules.

The Galaxy Editor is not the same thing as Battle.net, which provides online services and distribution features. It also should not be confused with the editor tools used for the original StarCraft, whose custom-map technology was different.