Soroptimist International, headquartered in Cambridge, UK, is the umbrella organization for Soroptimists worldwide. 

Soroptimist International includes four Federations:

• Soroptimist International of the Americas (SIA)
• Soroptimist International of Europe (SIE)
• Soroptimist International of Great Britain and Ireland (SIGBI)
• Soroptimist International of the South West Pacific (SISWP)

Soroptimist International of the Americas is divided into 28 geographic regions to better serve the organizations' US membership. Links are provided when known:

Project Independence
United Nations