Organizer could refer to:
- Union organizer, a trade union official
- Party organizer, a political party official
- Community organizing, a way of building democratic power for the powerless
- Personal organizer, a type of diary
- Electronic organizer, an electronic version of a personal organizer.
- Professional organizer, a person who helps others get organized.
- Spemann-Mangold Organizer, also called embryonic induction, a cell or tissue which sends signals to other cells to instruct the fate of these cells
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